diff --git a/libsgp4/TimeSpan.h b/libsgp4/TimeSpan.h
index 52a5c68..2cde2c8 100644
--- a/libsgp4/TimeSpan.h
+++ b/libsgp4/TimeSpan.h
@@ -88,7 +88,7 @@ public:
         {
             ret = -1;
         }
-        if (m_ticks < ts.m_ticks)
+        if (m_ticks > ts.m_ticks)
         {
             ret = 1;
         }