diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index 5d33670ce..01b19bc39 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -47,6 +47,7 @@
 #include "vectors.h"
 #include "r_defs.h"
 #include "r_sky.h"
+#include "portal.h"
 
 #include "gl/system/gl_cvars.h"
 #include "gl/renderer/gl_lightdata.h"