diff --git a/src/private/MDMViewControllerTransitionCoordinator.m b/src/private/MDMViewControllerTransitionCoordinator.m
index 4da369e..d6e1d06 100644
--- a/src/private/MDMViewControllerTransitionCoordinator.m
+++ b/src/private/MDMViewControllerTransitionCoordinator.m
@@ -16,6 +16,8 @@
 
 #import "MDMViewControllerTransitionCoordinator.h"
 
+#import <QuartzCore/QuartzCore.h>
+
 #import "MDMTransition.h"
 
 @class MDMViewControllerTransitionContextNode;