diff --git a/exec/objdb.c b/exec/objdb.c
index 0c037105..7c4af4d2 100644
--- a/exec/objdb.c
+++ b/exec/objdb.c
@@ -113,7 +113,7 @@ static struct hdb_handle_database object_find_instance_database = {
 };
 
 
-static void objdb_wrlock()
+static void objdb_wrlock(void)
 {
 	pthread_mutex_lock(&meta_lock);
 	pthread_rwlock_wrlock(&reload_lock);
@@ -121,7 +121,7 @@ static void objdb_wrlock()
 	pthread_mutex_unlock(&meta_lock);
 }
 
-static void objdb_rdlock()
+static void objdb_rdlock(void)
 {
 	pthread_mutex_lock(&meta_lock);
 	if (lock_thread != pthread_self())
@@ -129,7 +129,7 @@ static void objdb_rdlock()
 	pthread_mutex_unlock(&meta_lock);
 }
 
-static void objdb_rdunlock()
+static void objdb_rdunlock(void)
 {
 	pthread_mutex_lock(&meta_lock);
 	if (lock_thread != pthread_self())
@@ -137,7 +137,7 @@ static void objdb_rdunlock()
 	pthread_mutex_unlock(&meta_lock);
 }
 
-static void objdb_wrunlock()
+static void objdb_wrunlock(void)
 {
 	pthread_mutex_lock(&meta_lock);
 	pthread_rwlock_unlock(&reload_lock);
diff --git a/services/cfg.c b/services/cfg.c
index 90e6685d..27e3842d 100644
--- a/services/cfg.c
+++ b/services/cfg.c
@@ -368,7 +368,7 @@ static void cfg_confchg_fn (
 /*
  * Tell other nodes we are shutting down
  */
-static int send_shutdown()
+static int send_shutdown(void)
 {
 	struct req_exec_cfg_shutdown req_exec_cfg_shutdown;
 	struct iovec iovec;
@@ -417,7 +417,7 @@ static void send_test_shutdown(void *only_conn, void *exclude_conn, int status)
 	LEAVE();
 }
 
-static void check_shutdown_status()
+static void check_shutdown_status(void)
 {
 	ENTER();
 
diff --git a/services/votequorum.c b/services/votequorum.c
index 27a6d1fe..0913f428 100644
--- a/services/votequorum.c
+++ b/services/votequorum.c
@@ -637,7 +637,7 @@ static int send_quorum_notification(void *conn, uint64_t context)
 	return 0;
 }
 
-static void send_expectedvotes_notification()
+static void send_expectedvotes_notification(void)
 {
 	struct res_lib_votequorum_expectedvotes_notification res_lib_votequorum_expectedvotes_notification;
 	struct quorum_pd *qpd;
diff --git a/tools/corosync-cfgtool.c b/tools/corosync-cfgtool.c
index d1b79bdb..783f05e9 100644
--- a/tools/corosync-cfgtool.c
+++ b/tools/corosync-cfgtool.c
@@ -149,7 +149,7 @@ void service_unload_do (char *service, unsigned int version)
 	(void)corosync_cfg_finalize (handle);
 }
 
-void shutdown_do()
+void shutdown_do(void)
 {
 	cs_error_t result;
 	corosync_cfg_handle_t handle;