diff --git a/src/signal.cpp b/src/signal.cpp
--- a/src/signal.cpp
+++ b/src/signal.cpp
@@ -216,9 +216,7 @@ static inline bool CheckAddToTodoSet(Til
 
 	assert(!_tbdset.IsIn(t1, d1)); // it really shouldn't be there already
 
-	if (_tbdset.Remove(t2, d2)) return false;
-
-	return true;
+	return !_tbdset.Remove(t2, d2);
 }