1 files changed, 1 insertions, 0 deletions
diff --git a/s51/s51.h b/s51/s51.h
index 7c96e2a6..eab61452 100644
--- a/s51/s51.h
+++ b/s51/s51.h
@@ -21,6 +21,7 @@
 extern char *s51_prompt;
 extern struct ccdbg *s51_dbg;
 extern int s51_interrupted;
+extern int s51_monitor;
 
 enum command_result {
 	command_success, command_debug, command_syntax, command_interrupt, command_error,