diff --git a/src/context.c b/src/context.c
index 987d5ea2..fd93c68b 100644
--- a/src/context.c
+++ b/src/context.c
@@ -819,10 +819,11 @@ tls_only_is_in_transports_list(getdns_context *context) {
 static int
 net_req_query_id_cmp(const void *id1, const void *id2)
 {
-	return (intptr_t)id1 - (intptr_t)id2;
-}
-/*
-{
+	/*
+	 * old code was:
+	 * return (intptr_t)id1 - (intptr_t)id2;
+	 *but this is incorrect on 64 bit architectures.
+	 */
 	int ret = 0;
 
 	if (id1 != id2)
@@ -832,7 +833,7 @@ net_req_query_id_cmp(const void *id1, const void *id2)
 
 	return ret;
 }
-*/
+
 
 static getdns_tsig_info const tsig_info[] = {
 	  { GETDNS_NO_TSIG, NULL, 0, NULL, 0, 0, 0 }