diff --git a/firmware/debug.c b/firmware/debug.c
index ec33cfca68..21583cd4be 100644
--- a/firmware/debug.c
+++ b/firmware/debug.c
@@ -215,11 +215,13 @@ void debug_init(void)
 
 void debugf(char *fmt, ...)
 {
+#ifdef DEBUG
     va_list ap;
     
     va_start( ap, fmt );
     vsnprintf( debugmembuf, sizeof(debugmembuf), fmt, ap );
     va_end( ap );
     printf( "%s", debugmembuf );
+#endif
 }
 #endif