diff --git a/DACircularProgress/DACircularProgressView.m b/DACircularProgress/DACircularProgressView.m
index ec4e30f..7efd287 100644
--- a/DACircularProgress/DACircularProgressView.m
+++ b/DACircularProgress/DACircularProgressView.m
@@ -123,7 +123,7 @@ - (void)drawInContext:(CGContextRef)context
 
 @end
 
-@interface DACircularProgressView ()
+@interface DACircularProgressView () <CAAnimationDelegate>
 
 @end