diff --git a/changelog/46.fixed.md b/changelog/46.fixed.md
new file mode 100644
index 00000000..b21af46d
--- /dev/null
+++ b/changelog/46.fixed.md
@@ -0,0 +1 @@
+`execute_graphql` method for InfrahubClient(Sync) now properly considers the `default_branch` setting
diff --git a/infrahub_sdk/client.py b/infrahub_sdk/client.py
index 3422535c..74f32d03 100644
--- a/infrahub_sdk/client.py
+++ b/infrahub_sdk/client.py
@@ -575,6 +575,7 @@ async def execute_graphql(
             _type_: _description_
         """
 
+        branch_name = branch_name or self.default_branch
         url = self._graphql_url(branch_name=branch_name, at=at)
 
         payload: dict[str, Union[str, dict]] = {"query": query}
@@ -1112,6 +1113,7 @@ def execute_graphql(
             dict: The result of the GraphQL query or mutation.
         """
 
+        branch_name = branch_name or self.default_branch
         url = self._graphql_url(branch_name=branch_name, at=at)
 
         payload: dict[str, Union[str, dict]] = {"query": query}
diff --git a/tests/unit/sdk/conftest.py b/tests/unit/sdk/conftest.py
index a870cfdb..680bc4ae 100644
--- a/tests/unit/sdk/conftest.py
+++ b/tests/unit/sdk/conftest.py
@@ -1958,25 +1958,25 @@ async def mock_rest_api_artifact_generate(httpx_mock: HTTPXMock) -> HTTPXMock:
 @pytest.fixture
 async def mock_query_mutation_schema_dropdown_add(httpx_mock: HTTPXMock) -> None:
     response = {"data": {"SchemaDropdownAdd": {"ok": True}}}
-    httpx_mock.add_response(method="POST", url="http://mock/graphql", json=response)
+    httpx_mock.add_response(method="POST", url="http://mock/graphql/main", json=response)
 
 
 @pytest.fixture
 async def mock_query_mutation_schema_dropdown_remove(httpx_mock: HTTPXMock) -> None:
     response = {"data": {"SchemaDropdownRemove": {"ok": True}}}
-    httpx_mock.add_response(method="POST", url="http://mock/graphql", json=response)
+    httpx_mock.add_response(method="POST", url="http://mock/graphql/main", json=response)
 
 
 @pytest.fixture
 async def mock_query_mutation_schema_enum_add(httpx_mock: HTTPXMock) -> None:
     response = {"data": {"SchemaEnumAdd": {"ok": True}}}
-    httpx_mock.add_response(method="POST", url="http://mock/graphql", json=response)
+    httpx_mock.add_response(method="POST", url="http://mock/graphql/main", json=response)
 
 
 @pytest.fixture
 async def mock_query_mutation_schema_enum_remove(httpx_mock: HTTPXMock) -> None:
     response = {"data": {"SchemaEnumRemove": {"ok": True}}}
-    httpx_mock.add_response(method="POST", url="http://mock/graphql", json=response)
+    httpx_mock.add_response(method="POST", url="http://mock/graphql/main", json=response)
 
 
 @pytest.fixture
diff --git a/tests/unit/sdk/test_client.py b/tests/unit/sdk/test_client.py
index 50dc0b34..eb0f0930 100644
--- a/tests/unit/sdk/test_client.py
+++ b/tests/unit/sdk/test_client.py
@@ -607,7 +607,7 @@ async def test_allocate_next_ip_prefix(
     assert ip_prefix.description.value == "test"
 
 
-EXPECTED_ECHO = """URL: http://mock/graphql
+EXPECTED_ECHO = """URL: http://mock/graphql/main
 QUERY:
 
     query GetTags($name: String!) {