diff --git a/src/network/kernel/qnetworkinterface_linux.cpp b/src/network/kernel/qnetworkinterface_linux.cpp
index b3b5e242b46..25aba5836e6 100644
--- a/src/network/kernel/qnetworkinterface_linux.cpp
+++ b/src/network/kernel/qnetworkinterface_linux.cpp
@@ -201,7 +201,7 @@ template <typename Lambda> struct ProcessNetlinkRequest
             }
 
 #ifndef QT_NO_DEBUG
-            if (NLMSG_OK(hdr, len))
+            if (NLMSG_OK(hdr, quint32(len)))
                 qWarning("QNetworkInterface/AF_NETLINK: received unknown packet type (%d) or too short (%u)",
                          hdr->nlmsg_type, hdr->nlmsg_len);
             else