diff --git a/libs/core/langchain_core/utils/json_schema.py b/libs/core/langchain_core/utils/json_schema.py
index 9628f9e521b..95313b3f954 100644
--- a/libs/core/langchain_core/utils/json_schema.py
+++ b/libs/core/langchain_core/utils/json_schema.py
@@ -13,7 +13,10 @@ def _retrieve_ref(path: str, schema: dict) -> dict:
         )
     out = schema
     for component in components[1:]:
-        out = out[component]
+        if component.isdigit():
+            out = out[int(component)]
+        else:
+            out = out[component]
     return deepcopy(out)
 
 
diff --git a/libs/core/tests/unit_tests/utils/test_json_schema.py b/libs/core/tests/unit_tests/utils/test_json_schema.py
index 3b0c7b4fe51..6f0a00fd99d 100644
--- a/libs/core/tests/unit_tests/utils/test_json_schema.py
+++ b/libs/core/tests/unit_tests/utils/test_json_schema.py
@@ -149,3 +149,35 @@ def test_dereference_refs_remote_ref() -> None:
     }
     with pytest.raises(ValueError):
         dereference_refs(schema)
+
+
+def test_dereference_refs_integer_ref() -> None:
+    schema = {
+        "type": "object",
+        "properties": {
+            "error_400": {"$ref": "#/$defs/400"},
+        },
+        "$defs": {
+            400: {
+                "type": "object",
+                "properties": {"description": "Bad Request"},
+            },
+        },
+    }
+    expected = {
+        "type": "object",
+        "properties": {
+            "error_400": {
+                "type": "object",
+                "properties": {"description": "Bad Request"},
+            },
+        },
+        "$defs": {
+            400: {
+                "type": "object",
+                "properties": {"description": "Bad Request"},
+            },
+        },
+    }
+    actual = dereference_refs(schema)
+    assert actual == expected