diff --git a/SGDP4.cpp b/SGDP4.cpp
index 314acbd..1e3af66 100644
--- a/SGDP4.cpp
+++ b/SGDP4.cpp
@@ -570,7 +570,7 @@ void SGDP4::CalculateFinalPositionVelocity(Eci& eci, const double& tsince, const
  * deep space initialization
  */
 void SGDP4::DeepSpaceInitialize(const double& eosq, const double& sinio, const double& cosio, const double& betao,
-        const double& theta2, const double& sing, const double& cosg, const double& betao2,
+        const double& theta2, const double& betao2,
         const double& xmdot, const double& omgdot, const double& xnodot) {
 
     double se = 0.0;