diff --git a/fastapi_code_generator/parser.py b/fastapi_code_generator/parser.py
index 0af2321..a40dd54 100644
--- a/fastapi_code_generator/parser.py
+++ b/fastapi_code_generator/parser.py
@@ -240,6 +240,13 @@ def get_argument_list(self, snake_case: bool) -> List[Argument]:
 
         if self.request:
             arguments.append(self.request)
+
+        positional_argument: bool = False
+        for argument in arguments:
+            if positional_argument and argument.required and argument.default is None:
+                argument.default = UsefulStr('...')
+            positional_argument = argument.required
+
         return arguments
 
     def get_data_type(self, schema: JsonSchemaObject, suffix: str = '') -> DataType:
diff --git a/tests/data/expected/openapi/default_template/body_and_parameters/main.py b/tests/data/expected/openapi/default_template/body_and_parameters/main.py
index 9c1e93d..6efa5bf 100644
--- a/tests/data/expected/openapi/default_template/body_and_parameters/main.py
+++ b/tests/data/expected/openapi/default_template/body_and_parameters/main.py
@@ -113,3 +113,11 @@ def get_users() -> List[UsersGetResponse]:
 @app.post('/users', response_model=None)
 def post_users(body: List[UsersPostRequest]) -> None:
     pass
+
+
+@app.post('/{ue_id}/sdm-subscriptions', response_model=None)
+def subscribe(ue_id: str = Path(..., alias='ueId'), body: Pet = ...) -> None:
+    """
+    subscribe to notifications
+    """
+    pass
diff --git a/tests/data/openapi/default_template/body_and_parameters.yaml b/tests/data/openapi/default_template/body_and_parameters.yaml
index f8b4085..340fbf3 100644
--- a/tests/data/openapi/default_template/body_and_parameters.yaml
+++ b/tests/data/openapi/default_template/body_and_parameters.yaml
@@ -317,6 +317,26 @@ paths:
       responses:
         '201':
           description: OK
+  /{ueId}/sdm-subscriptions:
+    post:
+      summary: subscribe to notifications
+      operationId: Subscribe
+      tags:
+        - Subscription Creation
+      parameters:
+        - name: ueId
+          in: path
+          description: Identity of the user
+          required: true
+          schema:
+            type: string
+      responses: {}
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/Pet'
+        required: true
 components:
   parameters:
     MyParam: