diff --git a/src/g_doom/a_doommisc.cpp b/src/g_doom/a_doommisc.cpp
index 4aa1c1791..6d64bc6b6 100644
--- a/src/g_doom/a_doommisc.cpp
+++ b/src/g_doom/a_doommisc.cpp
@@ -14,6 +14,7 @@
 #include "templates.h"
 #include "m_bbox.h"
 #include "farchive.h"
+#include "portal.h"
 
 // Include all the other Doom stuff here to reduce compile time
 #include "a_arachnotron.cpp"