diff --git a/Contrib/ExDLL/plugin.h b/Contrib/ExDLL/plugin.h
index b7759dc0..732322f0 100644
--- a/Contrib/ExDLL/plugin.h
+++ b/Contrib/ExDLL/plugin.h
@@ -1,6 +1,10 @@
 #ifndef ___NSIS_PLUGIN__H___
 #define ___NSIS_PLUGIN__H___
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include "api.h"
 
 #ifndef NSISCALL
@@ -56,4 +60,8 @@ void NSISCALL pushstring(const char *str);
 char * NSISCALL getuservariable(const int varnum);
 void NSISCALL setuservariable(const int varnum, const char *var);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif//!___NSIS_PLUGIN__H___