diff --git a/src/eap_peer/eap_ttls.c b/src/eap_peer/eap_ttls.c
index 25737803b..e8f0f38f0 100644
--- a/src/eap_peer/eap_ttls.c
+++ b/src/eap_peer/eap_ttls.c
@@ -202,7 +202,7 @@ static u8 * eap_ttls_avp_hdr(u8 *avphdr, u32 avp_code, u32 vendor_id,
 	}
 
 	avp->avp_code = host_to_be32(avp_code);
-	avp->avp_length = host_to_be32((flags << 24) | (hdrlen + len));
+	avp->avp_length = host_to_be32((flags << 24) | (u32) (hdrlen + len));
 
 	return avphdr + hdrlen;
 }