diff --git a/aegisub/src/video_box.h b/aegisub/src/video_box.h
index 736adfba6..119cb78f1 100644
--- a/aegisub/src/video_box.h
+++ b/aegisub/src/video_box.h
@@ -34,8 +34,6 @@
 /// @ingroup main_ui video
 ///
 
-#pragma once
-
 #ifndef AGI_PRE
 #include <list>