diff --git a/Source/debug.cpp b/Source/debug.cpp
index a0bab453d..20d678749 100644
--- a/Source/debug.cpp
+++ b/Source/debug.cpp
@@ -840,8 +840,9 @@ bool IsDebugGridInMegatiles()
 	case DebugGridTextItem::pdungeon:
 	case DebugGridTextItem::dflags:
 		return true;
+	default:
+		return false;
 	}
-	return false;
 }
 
 bool GetDebugGridText(Point dungeonCoords, char *debugGridTextBuffer)