diff --git a/CHANGES b/CHANGES
index 35b32936fe..a71edfb06a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+4230.	[contrib]	dlz_wildcard_dynamic.c:dlz_create could return a
+			uninitalised result. [RT #40839]
+
 4229.	[bug]		A variable could be used uninitalised in
 			dns_update_signaturesinc. [RT #40784]
 
diff --git a/contrib/dlz/modules/wildcard/dlz_wildcard_dynamic.c b/contrib/dlz/modules/wildcard/dlz_wildcard_dynamic.c
index 8225d1ac80..875d4ff12a 100644
--- a/contrib/dlz/modules/wildcard/dlz_wildcard_dynamic.c
+++ b/contrib/dlz/modules/wildcard/dlz_wildcard_dynamic.c
@@ -434,12 +434,11 @@ dlz_create(const char *dlzname, unsigned int argc, char *argv[],
 	DLZ_LIST_INIT(cd->rrs_list);
 
 	cd->zone_pattern = strdup(argv[1]);
-	if (cd->zone_pattern == NULL)
-		goto cleanup;
-
 	cd->axfr_pattern = strdup(argv[2]);
-	if (cd->axfr_pattern == NULL)
+	if (cd->zone_pattern == NULL || cd->axfr_pattern == NULL) {
+		result = ISC_R_NOMEMORY;
 		goto cleanup;
+	}
 
 	def_ttl = strtol(argv[3], &endp, 10);
 	if (*endp != '\0' || def_ttl < 0) {