diff --git a/openbsc/include/openbsc/db.h b/openbsc/include/openbsc/db.h
index 37011a1..d0c85ea 100644
--- a/openbsc/include/openbsc/db.h
+++ b/openbsc/include/openbsc/db.h
@@ -31,8 +31,8 @@
 
 /* one time initialisation */
 int db_init(const char *name);
-int db_prepare();
-int db_fini();
+int db_prepare(void);
+int db_fini(void);
 
 /* subscriber management */
 struct gsm_subscriber *db_create_subscriber(struct gsm_network *net,
diff --git a/openbsc/src/libmsc/db.c b/openbsc/src/libmsc/db.c
index 126ce66..a7eeda4 100644
--- a/openbsc/src/libmsc/db.c
+++ b/openbsc/src/libmsc/db.c
@@ -221,7 +221,7 @@
 }
 
 
-int db_prepare()
+int db_prepare(void)
 {
 	dbi_result result;
 	int i;
@@ -245,7 +245,7 @@
 	return 0;
 }
 
-int db_fini()
+int db_fini(void)
 {
 	dbi_conn_close(conn);
 	dbi_shutdown();