diff --git a/tests/utests/data/test_parser_json.c b/tests/utests/data/test_parser_json.c
index 9e99e34..e5513da 100644
--- a/tests/utests/data/test_parser_json.c
+++ b/tests/utests/data/test_parser_json.c
@@ -45,6 +45,7 @@
             "leaf-list ll1 { type uint8; }"
             "leaf foo2 { type string; default \"default-val\"; }"
             "leaf foo3 { type uint32; }"
+            "leaf foo4 { type uint64; }"
             "notification n2;}";
 
     UTEST_SETUP;
@@ -526,6 +527,19 @@
     CHECK_LYD_STRING(tree, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS, data);
     lyd_free_all(tree);
 
+    /* wrong encoding */
+    data = "{\"a:foo3\":\"25\"}";
+    CHECK_PARSE_LYD(data, LYD_PARSE_OPAQ | LYD_PARSE_ONLY, 0, tree);
+    CHECK_LYD_NODE_OPAQ((struct lyd_node_opaq *)tree, 0, 0, LY_VALUE_JSON, "foo3", 0, 0, NULL,  0,  "25");
+    CHECK_LYD_STRING(tree, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS, data);
+    lyd_free_all(tree);
+
+    data = "{\"a:foo4\":25}";
+    CHECK_PARSE_LYD(data, LYD_PARSE_OPAQ | LYD_PARSE_ONLY, 0, tree);
+    CHECK_LYD_NODE_OPAQ((struct lyd_node_opaq *)tree, 0, 0, LY_VALUE_JSON, "foo4", 0, 0, NULL,  0,  "25");
+    CHECK_LYD_STRING(tree, LYD_PRINT_SHRINK | LYD_PRINT_WITHSIBLINGS, data);
+    lyd_free_all(tree);
+
     /* missing key, no flags */
     data = "{\"a:l1\":[{\"a\":\"val_a\",\"b\":\"val_b\",\"d\":\"val_d\"}]}";
     PARSER_CHECK_ERROR(data, 0, LYD_VALIDATE_PRESENT, tree, LY_EVALID,