diff --git a/MVMCore/MVMCore/PresentationHandling/MVMCoreViewControllerAnimatedTransitioning.h b/MVMCore/MVMCore/PresentationHandling/MVMCoreViewControllerAnimatedTransitioning.h
index 9a4a384..c5fc952 100644
--- a/MVMCore/MVMCore/PresentationHandling/MVMCoreViewControllerAnimatedTransitioning.h
+++ b/MVMCore/MVMCore/PresentationHandling/MVMCoreViewControllerAnimatedTransitioning.h
@@ -10,7 +10,8 @@
 
 @protocol MVMCoreViewControllerAnimatedTransitioning <UIViewControllerAnimatedTransitioning>
 
-@optional
+@required
+
 @property (nonatomic) BOOL interactiveTransitionCanceled;
 
 @end