diff --git a/src/engine.cpp b/src/engine.cpp
index 189aa83..bc2da9b 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -125,7 +125,7 @@ bool engineDecOffTime() {
 	return res;
 }
 
-void engineDecOnTime() {
+bool engineDecOnTime() {
 	bool res = false;
 	if (onTime != 0) {
 		onTime -= STEP_100ms;