diff --git a/include/re_types.h b/include/re_types.h
index 517321d..8acb90c 100644
--- a/include/re_types.h
+++ b/include/re_types.h
@@ -93,8 +93,10 @@ typedef bool _Bool;
 
 /* Needed for MS compiler */
 #ifdef _MSC_VER
+#ifndef __cplusplus
 #define inline _inline
 #endif
+#endif
 
 
 /*