diff --git a/src/modules/module-protocol-pulse/pulse-server.c b/src/modules/module-protocol-pulse/pulse-server.c
index 21c4d06ab..cb9908e94 100644
--- a/src/modules/module-protocol-pulse/pulse-server.c
+++ b/src/modules/module-protocol-pulse/pulse-server.c
@@ -1299,6 +1299,7 @@ do_process_done(struct spa_loop *loop,
 
 			while ((uint32_t)avail >= stream->attr.fragsize) {
 				towrite = SPA_MIN(avail, MAX_FRAGSIZE);
+				towrite = SPA_ROUND_DOWN(towrite, stream->frame_size);
 
 				msg = message_alloc(impl, stream->channel, towrite);
 				if (msg == NULL)