diff --git a/src/cluster_legacy.c b/src/cluster_legacy.c
index d67edc4e5f..b44d96806b 100644
--- a/src/cluster_legacy.c
+++ b/src/cluster_legacy.c
@@ -3195,7 +3195,7 @@ int clusterIsValidPacket(clusterLink *link) {
         if (hdr->mflags[0] & CLUSTERMSG_FLAG0_EXT_DATA) {
             clusterMsgPingExt *ext = getInitialPingExt(hdr, count);
             while (extensions--) {
-                uint16_t extlen = getPingExtLength(ext);
+                uint32_t extlen = getPingExtLength(ext);
                 if (extlen % 8 != 0) {
                     serverLog(LL_WARNING, "Received a %s packet without proper padding (%d bytes)",
                               clusterGetMessageTypeString(type), (int)extlen);