diff --git a/src/mapper/mapper.c b/src/mapper/mapper.c
index 0309ecb39..71bdecf3b 100644
--- a/src/mapper/mapper.c
+++ b/src/mapper/mapper.c
@@ -48,6 +48,7 @@
 #include <plane.h>
 #include <teleport.h>
 #include <resources.h>
+#include <building.h>
 
 /* libc includes */
 #include <ctype.h>