diff --git a/src/touchhandler/TouchHandler.h b/src/touchhandler/TouchHandler.h
index 2eb997c6..dd64a6d6 100644
--- a/src/touchhandler/TouchHandler.h
+++ b/src/touchhandler/TouchHandler.h
@@ -24,7 +24,7 @@ namespace Pinetime {
         bool touching;
       };
 
-      TouchProcessReply ProcessTouchInfo(Drivers::Cst816S::TouchInfos info, bool buttonUnlocksOn);
+      TouchProcessReply ProcessTouchInfo(Drivers::Cst816S::TouchInfos info, bool buttonUnlocksOn=false);
 
       bool IsTouching() const {
         return currentTouchPoint.touching;