diff --git a/py/stackctrl.h b/py/stackctrl.h
index ff8da0ab1..c21288b2b 100644
--- a/py/stackctrl.h
+++ b/py/stackctrl.h
@@ -40,7 +40,7 @@ void mp_stack_check(void);
 
 #else
 
-#define mp_stack_set_limit(limit)
+#define mp_stack_set_limit(limit) (void)(limit)
 #define MP_STACK_CHECK()
 
 #endif