diff --git a/mex/sources/ms-sbvar/modify_for_mex.cc b/mex/sources/ms-sbvar/modify_for_mex.cc
index 0b0b525a4..521497272 100644
--- a/mex/sources/ms-sbvar/modify_for_mex.cc
+++ b/mex/sources/ms-sbvar/modify_for_mex.cc
@@ -18,13 +18,14 @@
  */
 
 #if defined(MATLAB_MEX_FILE) || defined(OCTAVE_MEX_FILE)
+
+#include <dynmex.h>
+
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
-#include <dynmex.h>
-
   int constant_seed;
 
   void