diff --git a/src/parser_xml.c b/src/parser_xml.c
index 0db10cae2..944d3d530 100644
--- a/src/parser_xml.c
+++ b/src/parser_xml.c
@@ -441,7 +441,9 @@ lydxml_get_hints_opaq(const char *name, size_t name_len, const char *value, size
 {
     struct lyd_node_opaq *opaq;
     char *ptr;
-    long num;
+    /* this needs to be at least 64bit, and it "should not" be an explicit int64_t
+     * because the code calls strtoll later on, which "might" return a bigger type */
+    long long num;
 
     *hints = 0;
     *anchor = NULL;
@@ -453,11 +455,11 @@ lydxml_get_hints_opaq(const char *name, size_t name_len, const char *value, size
         /* boolean value */
         *hints |= LYD_VALHINT_BOOLEAN;
     } else {
-        num = strtol(value, &ptr, 10);
+        num = strtoll(value, &ptr, 10);
         if ((unsigned)(ptr - value) == value_len) {
             /* number value */
             *hints |= LYD_VALHINT_DECNUM;
-            if ((num < INT32_MIN) || (num > (long)UINT32_MAX)) {
+            if ((num < INT32_MIN) || (num > UINT32_MAX)) {
                 /* large number */
                 *hints |= LYD_VALHINT_NUM64;
             }
diff --git a/tests/utests/data/test_parser_xml.c b/tests/utests/data/test_parser_xml.c
index d5336c030..28c37709a 100644
--- a/tests/utests/data/test_parser_xml.c
+++ b/tests/utests/data/test_parser_xml.c
@@ -193,6 +193,18 @@ test_anyxml(void **state)
     free(str);
     CHECK_LYD_STRING(tree, LYD_PRINT_WITHSIBLINGS, data_expected);
     lyd_free_all(tree);
+
+    data = "<anyx xmlns=\"urn:tests:a\"><x>1</x><x>0</x><x>-1</x><x>4294967295</x><x>4294967296</x><x>-2147483648</x><x>-2147483649</x></anyx>";
+    CHECK_PARSE_LYD(data, 0, LYD_VALIDATE_PRESENT, tree);
+    assert_non_null(tree);
+    tree = tree->next;
+    assert_int_equal(LY_SUCCESS, lyd_print_mem(&str, tree, LYD_XML, LYD_PRINT_SHRINK));
+    CHECK_STRING(str, data);
+    free(str);
+    assert_int_equal(LY_SUCCESS, lyd_print_mem(&str, tree, LYD_JSON, LYD_PRINT_SHRINK));
+    CHECK_STRING(str, "{\"a:anyx\":{\"x\":[1,0,-1,4294967295,\"4294967296\",-2147483648,\"-2147483649\"]}}");
+    free(str);
+    lyd_free_all(tree);
 }
 
 static void