diff --git a/STPopup/STPopupController.h b/STPopup/STPopupController.h
index 2563ae7..dac7669 100644
--- a/STPopup/STPopupController.h
+++ b/STPopup/STPopupController.h
@@ -19,6 +19,10 @@ typedef NS_ENUM(NSUInteger, STPopupTransitionStyle) {
     STPopupTransitionStyleFade
 };
 
+@interface STPopupContainerViewController : UIViewController
+
+@end
+
 @interface STPopupController : NSObject
 
 @property (nonatomic, assign) STPopupStyle style;
diff --git a/STPopup/STPopupController.m b/STPopup/STPopupController.m
index ddac0df..d633168 100644
--- a/STPopup/STPopupController.m
+++ b/STPopup/STPopupController.m
@@ -16,10 +16,6 @@
 
 static NSMutableSet *_retainedPopupControllers;
 
-@interface STPopupContainerViewController : UIViewController
-
-@end
-
 @implementation STPopupContainerViewController
 
 - (UIStatusBarStyle)preferredStatusBarStyle