diff --git a/include/debug.h b/include/debug.h
index 88cc2541..318b418d 100644
--- a/include/debug.h
+++ b/include/debug.h
@@ -24,6 +24,7 @@ void DEBUG_Enable(bool pressed);
 void DEBUG_CheckExecuteBreakpoint(Bit16u seg, Bit32u off);
 bool DEBUG_ExitLoop(void);
 void DEBUG_RefreshPage(char scroll);
+Bitu DEBUG_EnableDebugger(void);
 
 extern Bitu cycle_count;
 extern Bitu debugCallback;