diff --git a/Source/cmCPluginAPI.cxx b/Source/cmCPluginAPI.cxx
index 411a28d08e..e237913558 100644
--- a/Source/cmCPluginAPI.cxx
+++ b/Source/cmCPluginAPI.cxx
@@ -518,7 +518,7 @@ public:
 };
 cmCPluginAPISourceFileMap cmCPluginAPISourceFiles;
 
-void * CCONV cmCreateSourceFile()
+void * CCONV cmCreateSourceFile(void)
 {
   return (void*)new cmCPluginAPISourceFile;
 }