diff --git a/aegisub/video_display.cpp b/aegisub/video_display.cpp
index f1761157f..650fe1c69 100644
--- a/aegisub/video_display.cpp
+++ b/aegisub/video_display.cpp
@@ -200,7 +200,7 @@ void VideoDisplay::Render() {
 // Update size
 void VideoDisplay::UpdateSize() {
 	// Loaded?
-	if (VideoContext::Get()->IsLoaded()) return;
+	if (!VideoContext::Get()->IsLoaded()) return;
 
 	// Get size
 	if (arType == 0) w = VideoContext::Get()->GetWidth() * zoomValue;