diff --git a/src/video/video_systems.cpp b/src/video/video_systems.cpp
index f991ee400c7..d2810234b8f 100644
--- a/src/video/video_systems.cpp
+++ b/src/video/video_systems.cpp
@@ -153,7 +153,7 @@ VideoSystem::new_surface_data(const Surface &surface)
 void
 VideoSystem::free_surface_data(SurfaceData* surface_data)
 {
-  if(surface_data == null)
+  if(surface_data == NULL)
     return;
 
   delete surface_data;