diff --git a/src/luop.h b/src/luop.h
index 053a025..d690243 100644
--- a/src/luop.h
+++ b/src/luop.h
@@ -28,6 +28,7 @@
 #include <osmocom/gsm/gsup.h>
 
 #include "db.h"
+#include "gsup_server.h"
 
 #define CANCEL_TIMEOUT_SECS	30
 #define ISD_TIMEOUT_SECS	30