diff --git a/src/functions/src/supabase_functions/_async/functions_client.py b/src/functions/src/supabase_functions/_async/functions_client.py
index 38ed3c61..ea2c502c 100644
--- a/src/functions/src/supabase_functions/_async/functions_client.py
+++ b/src/functions/src/supabase_functions/_async/functions_client.py
@@ -1,7 +1,7 @@
 from typing import Any, Dict, Literal, Optional, Union
 from warnings import warn
 
-from httpx import AsyncClient, HTTPError, Response
+from httpx import AsyncClient, HTTPError, Response, QueryParams
 
 from ..errors import FunctionsHttpError, FunctionsRelayError
 from ..utils import (
@@ -73,11 +73,16 @@ async def _request(
         url: str,
         headers: Optional[Dict[str, str]] = None,
         json: Optional[Dict[Any, Any]] = None,
+        params: Optional[QueryParams] = None,
     ) -> Response:
         response = (
-            await self._client.request(method, url, data=json, headers=headers)
+            await self._client.request(
+                method, url, data=json, headers=headers, params=params
+            )
             if isinstance(json, str)
-            else await self._client.request(method, url, json=json, headers=headers)
+            else await self._client.request(
+                method, url, json=json, headers=headers, params=params
+            )
         )
         try:
             response.raise_for_status()
@@ -121,8 +126,11 @@ async def invoke(
         if not is_valid_str_arg(function_name):
             raise ValueError("function_name must a valid string value.")
         headers = self.headers
+        params = QueryParams()
         body = None
         response_type = "text/plain"
+        url = f"{self.url}/{function_name}"
+
         if invoke_options is not None:
             headers.update(invoke_options.get("headers", {}))
             response_type = invoke_options.get("responseType", "text/plain")
@@ -135,6 +143,8 @@ async def invoke(
 
                 if region.value != "any":
                     headers["x-region"] = region.value
+                    # Add region as query parameter
+                    params = params.set("forceFunctionRegion", region.value)
 
             body = invoke_options.get("body")
             if isinstance(body, str):
@@ -143,7 +153,7 @@ async def invoke(
                 headers["Content-Type"] = "application/json"
 
         response = await self._request(
-            "POST", f"{self.url}/{function_name}", headers=headers, json=body
+            "POST", url, headers=headers, json=body, params=params
         )
         is_relay_error = response.headers.get("x-relay-header")
 
diff --git a/src/functions/src/supabase_functions/_sync/functions_client.py b/src/functions/src/supabase_functions/_sync/functions_client.py
index 95d30e42..8063a7d3 100644
--- a/src/functions/src/supabase_functions/_sync/functions_client.py
+++ b/src/functions/src/supabase_functions/_sync/functions_client.py
@@ -1,7 +1,7 @@
 from typing import Any, Dict, Literal, Optional, Union
 from warnings import warn
 
-from httpx import Client, HTTPError, Response
+from httpx import Client, HTTPError, Response, QueryParams
 
 from ..errors import FunctionsHttpError, FunctionsRelayError
 from ..utils import (
@@ -73,11 +73,14 @@ def _request(
         url: str,
         headers: Optional[Dict[str, str]] = None,
         json: Optional[Dict[Any, Any]] = None,
+        params: Optional[QueryParams] = None,
     ) -> Response:
         response = (
-            self._client.request(method, url, data=json, headers=headers)
+            self._client.request(method, url, data=json, headers=headers, params=params)
             if isinstance(json, str)
-            else self._client.request(method, url, json=json, headers=headers)
+            else self._client.request(
+                method, url, json=json, headers=headers, params=params
+            )
         )
         try:
             response.raise_for_status()
@@ -121,8 +124,11 @@ def invoke(
         if not is_valid_str_arg(function_name):
             raise ValueError("function_name must a valid string value.")
         headers = self.headers
+        params = QueryParams()
         body = None
         response_type = "text/plain"
+        url = f"{self.url}/{function_name}"
+
         if invoke_options is not None:
             headers.update(invoke_options.get("headers", {}))
             response_type = invoke_options.get("responseType", "text/plain")
@@ -135,6 +141,8 @@ def invoke(
 
                 if region.value != "any":
                     headers["x-region"] = region.value
+                    # Add region as query parameter
+                    params = params.set("forceFunctionRegion", region.value)
 
             body = invoke_options.get("body")
             if isinstance(body, str):
@@ -142,9 +150,7 @@ def invoke(
             elif isinstance(body, dict):
                 headers["Content-Type"] = "application/json"
 
-        response = self._request(
-            "POST", f"{self.url}/{function_name}", headers=headers, json=body
-        )
+        response = self._request("POST", url, headers=headers, json=body, params=params)
         is_relay_error = response.headers.get("x-relay-header")
 
         if is_relay_error and is_relay_error == "true":
diff --git a/src/functions/tests/_async/test_function_client.py b/src/functions/tests/_async/test_function_client.py
index f9b7e61d..d1f47b97 100644
--- a/src/functions/tests/_async/test_function_client.py
+++ b/src/functions/tests/_async/test_function_client.py
@@ -100,8 +100,11 @@ async def test_invoke_with_region(client: AsyncFunctionsClient):
 
         await client.invoke("test-function", {"region": FunctionRegion("us-east-1")})
 
-        _, kwargs = mock_request.call_args
+        args, kwargs = mock_request.call_args
+        # Check that x-region header is present
         assert kwargs["headers"]["x-region"] == "us-east-1"
+        # Check that the URL contains the forceFunctionRegion query parameter
+        assert kwargs["params"]["forceFunctionRegion"] == "us-east-1"
 
 
 async def test_invoke_with_region_string(client: AsyncFunctionsClient):
@@ -118,8 +121,11 @@ async def test_invoke_with_region_string(client: AsyncFunctionsClient):
         with pytest.warns(UserWarning, match=r"Use FunctionRegion\(us-east-1\)"):
             await client.invoke("test-function", {"region": "us-east-1"})
 
-        _, kwargs = mock_request.call_args
+        args, kwargs = mock_request.call_args
+        # Check that x-region header is present
         assert kwargs["headers"]["x-region"] == "us-east-1"
+        # Check that the URL contains the forceFunctionRegion query parameter
+        assert kwargs["params"]["forceFunctionRegion"] == "us-east-1"
 
 
 async def test_invoke_with_http_error(client: AsyncFunctionsClient):
diff --git a/src/functions/tests/_sync/test_function_client.py b/src/functions/tests/_sync/test_function_client.py
index 7f2b8194..6489e91a 100644
--- a/src/functions/tests/_sync/test_function_client.py
+++ b/src/functions/tests/_sync/test_function_client.py
@@ -94,8 +94,11 @@ def test_invoke_with_region(client: SyncFunctionsClient):
 
         client.invoke("test-function", {"region": FunctionRegion("us-east-1")})
 
-        _, kwargs = mock_request.call_args
+        args, kwargs = mock_request.call_args
+        # Check that x-region header is present
         assert kwargs["headers"]["x-region"] == "us-east-1"
+        # Check that the URL contains the forceFunctionRegion query parameter
+        assert kwargs["params"]["forceFunctionRegion"] == "us-east-1"
 
 
 def test_invoke_with_region_string(client: SyncFunctionsClient):
@@ -110,8 +113,11 @@ def test_invoke_with_region_string(client: SyncFunctionsClient):
         with pytest.warns(UserWarning, match=r"Use FunctionRegion\(us-east-1\)"):
             client.invoke("test-function", {"region": "us-east-1"})
 
-        _, kwargs = mock_request.call_args
+        args, kwargs = mock_request.call_args
+        # Check that x-region header is present
         assert kwargs["headers"]["x-region"] == "us-east-1"
+        # Check that the URL contains the forceFunctionRegion query parameter
+        assert kwargs["params"]["forceFunctionRegion"] == "us-east-1"
 
 
 def test_invoke_with_http_error(client: SyncFunctionsClient):