diff --git a/src/terraform_gui.cpp b/src/terraform_gui.cpp
--- a/src/terraform_gui.cpp
+++ b/src/terraform_gui.cpp
@@ -31,7 +31,9 @@
 #include "hotkeys.h"
 #include "engine_base.h"
 #include "terraform_gui.h"
+#include "terraform_cmd.h"
 #include "zoom_func.h"
+#include "rail_cmd.h"
 
 #include "widgets/terraform_widget.h"