diff --git a/uYouPlus.xm b/uYouPlus.xm
index e1d2e32..3d43874 100644
--- a/uYouPlus.xm
+++ b/uYouPlus.xm
@@ -2,6 +2,7 @@
 #import <Foundation/Foundation.h>
 #import <objc/runtime.h>
 #import <dlfcn.h>
+#import <substrate.h>
 #import "Header.h"
 #import "Tweaks/YouTubeHeader/YTVideoQualitySwitchOriginalController.h"
 #import "Tweaks/YouTubeHeader/YTPlayerViewController.h"