diff --git a/src/Avalonia.Native.OSX/platformthreading.mm b/src/Avalonia.Native.OSX/platformthreading.mm
index 07e307af74..c1ca6b6421 100644
--- a/src/Avalonia.Native.OSX/platformthreading.mm
+++ b/src/Avalonia.Native.OSX/platformthreading.mm
@@ -157,6 +157,7 @@ NSArray<NSString*>* _modes;
 -(void) perform
 {
     @synchronized (self) {
+        _signaled  = false;
         if(_parent != NULL && _parent->SignaledCallback != NULL)
             _parent->SignaledCallback->Signaled(0, false);
     }