diff --git a/evthread-internal.h b/evthread-internal.h
index 16adf167..efdecf81 100644
--- a/evthread-internal.h
+++ b/evthread-internal.h
@@ -377,9 +377,9 @@ int evutil_global_setup_locks_(const int enable_locks);
 int evutil_secure_rng_global_setup_locks_(const int enable_locks);
 
 /** Return current evthread_lock_callbacks */
-struct evthread_lock_callbacks *evthread_get_lock_callbacks();
+struct evthread_lock_callbacks *evthread_get_lock_callbacks(void);
 /** Return current evthread_condition_callbacks */
-struct evthread_condition_callbacks *evthread_get_condition_callbacks();
+struct evthread_condition_callbacks *evthread_get_condition_callbacks(void);
 /** Disable locking for internal usage (like global shutdown) */
 void evthreadimpl_disable_lock_debugging_(void);
 
diff --git a/test/regress_bufferevent.c b/test/regress_bufferevent.c
index a1998ba6..a87e02ed 100644
--- a/test/regress_bufferevent.c
+++ b/test/regress_bufferevent.c
@@ -233,10 +233,11 @@ static lock_wrapper *lu_find(void *lock_)
 
 static void *trace_lock_alloc(unsigned locktype)
 {
+	void *lock;
 	++lu_base.nr_locks;
 	lu_base.locks = realloc(lu_base.locks,
 		sizeof(lock_wrapper) * lu_base.nr_locks);
-	void *lock = lu_base.cbs.alloc(locktype);
+	lock = lu_base.cbs.alloc(locktype);
 	lu_base.locks[lu_base.nr_locks - 1] = (lock_wrapper){ lock, ALLOC, 0 };
 	return lock;
 }
@@ -273,7 +274,7 @@ static int trace_lock_unlock(unsigned mode, void *lock_)
 		return lu_base.cbs.unlock(mode, lock_);
 	}
 }
-static void lock_unlock_free_thread_cbs()
+static void lock_unlock_free_thread_cbs(void)
 {
 	event_base_free(NULL);