diff --git a/Lib/scilab/scirun.swg b/Lib/scilab/scirun.swg
index 8acb14513..ccdef11b6 100644
--- a/Lib/scilab/scirun.swg
+++ b/Lib/scilab/scirun.swg
@@ -27,9 +27,11 @@ static void SWIG_Scilab_SetOutputPosition(int _outputPosition) {
 #define Scilab_Error_Occurred() 0
 #define SWIG_Scilab_AddErrorMsg(msg) {;}
 
+#ifdef __cplusplus
 namespace std {
     class SciObject {
     public:
         SciObject();
     };
 }
+#endif