diff --git a/openbsc/src/libmsc/gsm_04_11.c b/openbsc/src/libmsc/gsm_04_11.c
index 0150de628..82e9faedf 100644
--- a/openbsc/src/libmsc/gsm_04_11.c
+++ b/openbsc/src/libmsc/gsm_04_11.c
@@ -57,8 +57,6 @@
 
 #ifdef BUILD_SMPP
 #include "smpp_smsc.h"
-extern int smpp_try_deliver(struct gsm_sms *sms,
-			    struct gsm_subscriber_connection *conn);
 #endif
 
 void *tall_gsms_ctx;
diff --git a/openbsc/src/libmsc/smpp_smsc.h b/openbsc/src/libmsc/smpp_smsc.h
index 21d28dda6..8d31b2b14 100644
--- a/openbsc/src/libmsc/smpp_smsc.h
+++ b/openbsc/src/libmsc/smpp_smsc.h
@@ -131,4 +131,12 @@ int smpp_route_pfx_del(struct osmo_smpp_acl *acl,
 int smpp_vty_init(void);
 
 int smpp_determine_scheme(uint8_t dcs, uint8_t *data_coding, int *mode);
+
+
+
+struct gsm_sms;
+struct gsm_subscriber_connection;
+
+int smpp_try_deliver(struct gsm_sms *sms,
+			    struct gsm_subscriber_connection *conn);
 #endif