diff --git a/include/mapper.h b/include/mapper.h
index 17b02211..bf329cb1 100644
--- a/include/mapper.h
+++ b/include/mapper.h
@@ -30,6 +30,7 @@ void MAPPER_AddHandler(MAPPER_Handler * handler,MapKeys key,Bitu mods,char const
 void MAPPER_Init(void);
 void MAPPER_StartUp(Section * sec);
 void MAPPER_Run(bool pressed);
+void MAPPER_RunInternal();
 void MAPPER_LosingFocus(void);