diff --git a/firmware/debug.h b/firmware/debug.h
index 876b8511a6..2f984ee55e 100644
--- a/firmware/debug.h
+++ b/firmware/debug.h
@@ -21,6 +21,9 @@
 
 extern void debug_init(void);
 extern void debugf(char* fmt,...);
+#ifndef SIMULATOR
+extern void dbg_ports(void);
+#endif
 
 #ifdef __GNUC__