diff --git a/components/isceobj/Util/denseoffsets/bindings/denseoffsetsmodule.cpp b/components/isceobj/Util/denseoffsets/bindings/denseoffsetsmodule.cpp
index 37f876a..47a103b 100644
--- a/components/isceobj/Util/denseoffsets/bindings/denseoffsetsmodule.cpp
+++ b/components/isceobj/Util/denseoffsets/bindings/denseoffsetsmodule.cpp
@@ -28,7 +28,7 @@
 
 
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "denseoffsetsmodule.h"
 #include <cmath>
@@ -232,11 +232,12 @@ PyObject * setScaleFactorY_C(PyObject* self, PyObject* args)
 PyObject * setDebugFlag_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
-        if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+        Py_ssize_t varSize;
+        if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
         {
                 return NULL;
         }
+        int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
         setDebugFlag_f(var,&varInt);
         return Py_BuildValue("i", 0);
 }
diff --git a/components/isceobj/Util/estimateoffsets/bindings/estimateoffsetsmodule.cpp b/components/isceobj/Util/estimateoffsets/bindings/estimateoffsetsmodule.cpp
index ec08f2d..cc059e1 100644
--- a/components/isceobj/Util/estimateoffsets/bindings/estimateoffsetsmodule.cpp
+++ b/components/isceobj/Util/estimateoffsets/bindings/estimateoffsetsmodule.cpp
@@ -28,7 +28,7 @@
 
 
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "estimateoffsetsmodule.h"
 #include <cmath>
@@ -433,11 +433,12 @@ PyObject * setSecondPRF_C(PyObject* self, PyObject* args)
 PyObject * setDebugFlag_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
-        if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+        Py_ssize_t varSize;
+        if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
         {
                 return NULL;
         }
+        int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
         setDebugFlag_f(var,&varInt);
         return Py_BuildValue("i", 0);
 }
diff --git a/components/iscesys/StdOE/bindings/StdOEmodule.cpp b/components/iscesys/StdOE/bindings/StdOEmodule.cpp
index bffb74b..baf2203 100644
--- a/components/iscesys/StdOE/bindings/StdOEmodule.cpp
+++ b/components/iscesys/StdOE/bindings/StdOEmodule.cpp
@@ -7,7 +7,7 @@
 //
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "StdOE.h"
 #include "StdOEmodule.h"
@@ -53,7 +53,7 @@ PyInit_StdOE()
 PyObject * setStdErr_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -65,7 +65,7 @@ PyObject * setStdErr_C(PyObject* self, PyObject* args)
 PyObject * setStdErrFileTag_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -77,7 +77,7 @@ PyObject * setStdErrFileTag_C(PyObject* self, PyObject* args)
 PyObject * setStdOutFileTag_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -89,7 +89,7 @@ PyObject * setStdOutFileTag_C(PyObject* self, PyObject* args)
 PyObject * setStdLogFileTag_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -101,7 +101,7 @@ PyObject * setStdLogFileTag_C(PyObject* self, PyObject* args)
 PyObject * setStdErrFile_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -113,7 +113,7 @@ PyObject * setStdErrFile_C(PyObject* self, PyObject* args)
 PyObject * setStdOut_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -125,7 +125,7 @@ PyObject * setStdOut_C(PyObject* self, PyObject* args)
 PyObject * setStdLogFile_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -137,7 +137,7 @@ PyObject * setStdLogFile_C(PyObject* self, PyObject* args)
 PyObject * setStdOutFile_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -161,7 +161,7 @@ PyObject * getStdErr_C(PyObject* self, PyObject* args)
 PyObject * writeStd_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -173,7 +173,7 @@ PyObject * writeStd_C(PyObject* self, PyObject* args)
 PyObject * writeStdLog_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -185,7 +185,7 @@ PyObject * writeStdLog_C(PyObject* self, PyObject* args)
 PyObject * writeStdOut_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -197,7 +197,7 @@ PyObject * writeStdOut_C(PyObject* self, PyObject* args)
 PyObject * writeStdErr_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
         {
                 return NULL;
@@ -209,9 +209,9 @@ PyObject * writeStdErr_C(PyObject* self, PyObject* args)
 PyObject * writeStdFile_C(PyObject* self, PyObject* args)
 {
         char * var;
-        int  varInt;
+        Py_ssize_t varInt;
         char * var1;
-        int  varInt1;
+        Py_ssize_t varInt1;
         if(!PyArg_ParseTuple(args, "s#s#", &var ,&varInt,&var1,&varInt1))
         {
                 return NULL;
diff --git a/components/mroipac/ampcor/bindings/ampcormodule.cpp b/components/mroipac/ampcor/bindings/ampcormodule.cpp
index c40a411..a5820c6 100644
--- a/components/mroipac/ampcor/bindings/ampcormodule.cpp
+++ b/components/mroipac/ampcor/bindings/ampcormodule.cpp
@@ -1,3 +1,4 @@
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "ampcormodule.h"
 #include <cmath>
@@ -44,12 +45,12 @@ PyInit_ampcor()
 PyObject* setImageDatatype1_C(PyObject* self, PyObject* args)
 {
   char* type;
-  int len;
+  Py_ssize_t len;
   if( !PyArg_ParseTuple(args,"s#",&type,&len) )
   {
     return NULL;
   }
-  setImageDatatype1_f(type,len);
+  setImageDatatype1_f(type, Py_SAFE_DOWNCAST(len, Py_ssize_t, int));
   return Py_BuildValue("i",0);
 }
 
@@ -79,12 +80,12 @@ PyObject* setImageLength1_C(PyObject* self, PyObject* args)
 PyObject* setImageDatatype2_C(PyObject* self, PyObject* args)
 {
   char* type;
-  int len;
+  Py_ssize_t len;
   if( !PyArg_ParseTuple(args,"s#",&type,&len) )
   {
     return NULL;
   }
-  setImageDatatype2_f(type,len);
+  setImageDatatype2_f(type, Py_SAFE_DOWNCAST(len, Py_ssize_t, int));
   return Py_BuildValue("i",0);
 }
 
diff --git a/components/stdproc/stdproc/estamb/bindings/estambmodule.cpp b/components/stdproc/stdproc/estamb/bindings/estambmodule.cpp
index d173da5..484fd47 100644
--- a/components/stdproc/stdproc/estamb/bindings/estambmodule.cpp
+++ b/components/stdproc/stdproc/estamb/bindings/estambmodule.cpp
@@ -27,7 +27,7 @@
 
 
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "estambmodule.h"
 #include <cmath>
@@ -531,33 +531,36 @@ PyObject * setTransDat_C(PyObject* self, PyObject* args)
 PyObject * setIQFlip_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setIQFlip_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
 PyObject * setDeskewFlag_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setDeskewFlag_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
 PyObject * setSecondaryRangeMigrationFlag_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setSecondaryRangeMigrationFlag_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
diff --git a/components/stdproc/stdproc/formslc/bindings/formslcmodule.cpp b/components/stdproc/stdproc/formslc/bindings/formslcmodule.cpp
index 154edcc..7b5a69a 100644
--- a/components/stdproc/stdproc/formslc/bindings/formslcmodule.cpp
+++ b/components/stdproc/stdproc/formslc/bindings/formslcmodule.cpp
@@ -27,7 +27,7 @@
 
 
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "formslcmodule.h"
 #include <cmath>
@@ -561,11 +561,12 @@ PyObject * setTransDat_C(PyObject* self, PyObject* args)
 PyObject * setIQFlip_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setIQFlip_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
@@ -573,11 +574,12 @@ PyObject * setIQFlip_C(PyObject* self, PyObject* args)
 PyObject * setDeskewFlag_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setDeskewFlag_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
@@ -585,11 +587,12 @@ PyObject * setDeskewFlag_C(PyObject* self, PyObject* args)
 PyObject * setSecondaryRangeMigrationFlag_C(PyObject* self, PyObject* args)
 {
     char * var;
-    int  varInt;
-    if(!PyArg_ParseTuple(args, "s#", &var ,&varInt))
+    Py_ssize_t varSize;
+    if(!PyArg_ParseTuple(args, "s#", &var, &varSize))
     {
         return NULL;
     }
+    int varInt = Py_SAFE_DOWNCAST(varSize, Py_ssize_t, int);
     setSecondaryRangeMigrationFlag_f(var,&varInt);
     return Py_BuildValue("i", 0);
 }
diff --git a/contrib/demUtils/correct_geoid_i2_srtm/bindings/correct_geoid_i2_srtmmodule.cpp b/contrib/demUtils/correct_geoid_i2_srtm/bindings/correct_geoid_i2_srtmmodule.cpp
index ccbf9ba..55033d2 100644
--- a/contrib/demUtils/correct_geoid_i2_srtm/bindings/correct_geoid_i2_srtmmodule.cpp
+++ b/contrib/demUtils/correct_geoid_i2_srtm/bindings/correct_geoid_i2_srtmmodule.cpp
@@ -27,7 +27,7 @@
 
 
 
-
+#define PY_SSIZE_T_CLEAN
 #include <Python.h>
 #include "correct_geoid_i2_srtmmodule.h"
 #include <cmath>
@@ -172,12 +172,13 @@ PyObject * setConversionType_C(PyObject* self, PyObject* args)
 PyObject * setGeoidFilename_C(PyObject* self, PyObject* args)
 {
     char * varChar;
-    int  var;
+    Py_ssize_t var;
     if(!PyArg_ParseTuple(args, "s#", &varChar ,&var))
     {
         return NULL;
     }
-    setGeoidFilename_f(varChar,&var);
+    int ivar = Py_SAFE_DOWNCAST(var, Py_ssize_t, int);
+    setGeoidFilename_f(varChar, &ivar);
     return Py_BuildValue("i", 0);
 }