diff --git a/service-src/databuffer.h b/service-src/databuffer.h
index 1563466c..5fbc79d0 100644
--- a/service-src/databuffer.h
+++ b/service-src/databuffer.h
@@ -62,7 +62,7 @@ _return_message(struct databuffer *db, struct messagepool *mp) {
 }
 
 static void
-databuffer_read(struct databuffer *db, struct messagepool *mp, void * buffer, int sz) {
+databuffer_read(struct databuffer *db, struct messagepool *mp, char * buffer, int sz) {
 	assert(db->size >= sz);
 	db->size -= sz;
 	for (;;) {
diff --git a/service-src/service_gate.c b/service-src/service_gate.c
index 0a7f6c8e..35fa3ea6 100644
--- a/service-src/service_gate.c
+++ b/service-src/service_gate.c
@@ -175,13 +175,13 @@ _forward(struct gate *g, struct connection * c, int size) {
 	}
 	if (g->broker) {
 		void * temp = skynet_malloc(size);
-		databuffer_read(&c->buffer,&g->mp,temp, size);
+		databuffer_read(&c->buffer,&g->mp,(char *)temp, size);
 		skynet_send(ctx, 0, g->broker, g->client_tag | PTYPE_TAG_DONTCOPY, fd, temp, size);
 		return;
 	}
 	if (c->agent) {
 		void * temp = skynet_malloc(size);
-		databuffer_read(&c->buffer,&g->mp,temp, size);
+		databuffer_read(&c->buffer,&g->mp,(char *)temp, size);
 		skynet_send(ctx, c->client, c->agent, g->client_tag | PTYPE_TAG_DONTCOPY, fd , temp, size);
 	} else if (g->watchdog) {
 		char * tmp = skynet_malloc(size + 32);