diff --git a/include/openbsc/vlr.h b/include/openbsc/vlr.h
index 90e3d7a..17cb2ae 100644
--- a/include/openbsc/vlr.h
+++ b/include/openbsc/vlr.h
@@ -11,6 +11,8 @@
 // for GSM_NAME_LENGTH
 #include <openbsc/gsm_subscriber.h>
 
+struct log_target;
+
 /* from 3s to 10s */
 #define GSM_29002_TIMER_S	10
 /* from 15s to 30s */
@@ -20,7 +22,6 @@
 /* from 28h to 38h */
 #define GSM_29002_TIMER_L	(32*60*60)
 
-
 /* VLR subscriber authentication state */
 enum vlr_subscr_auth_state {
 	/* subscriber needs to be autenticated */