diff --git a/src/server/xmppclient.c b/src/server/xmppclient.c
index 0caf25f..c4086b7 100644
--- a/src/server/xmppclient.c
+++ b/src/server/xmppclient.c
@@ -54,7 +54,7 @@ xmppclient_end_session(XMPPClient *client)
 
     if (client->sock) {
         shutdown(client->sock, 2);
-        while (recv(client->sock, NULL, 1, 0) > 0) {}
+        char discard_buf; while (recv(client->sock, &discard_buf, 1, 0) > 0) {}
         close(client->sock);
     }
     free(client->ip);