diff --git a/packages/mistralai_gcp/src/mistralai_gcp/sdk.py b/packages/mistralai_gcp/src/mistralai_gcp/sdk.py
index dd93cc7f..ae2b4483 100644
--- a/packages/mistralai_gcp/src/mistralai_gcp/sdk.py
+++ b/packages/mistralai_gcp/src/mistralai_gcp/sdk.py
@@ -226,6 +226,7 @@ def before_request(
             headers=headers,
             content=new_content,
             stream=None,
+            extensions=request.extensions,
         )
 
         return next_request
diff --git a/src/mistralai/extra/tests/test_gcp_timeout_extensions.py b/src/mistralai/extra/tests/test_gcp_timeout_extensions.py
new file mode 100644
index 00000000..1ff39b1d
--- /dev/null
+++ b/src/mistralai/extra/tests/test_gcp_timeout_extensions.py
@@ -0,0 +1,25 @@
+import sys
+from pathlib import Path
+import httpx
+
+# Add the mistralai_gcp package to the path for imports
+gcp_package_path = Path(__file__).parent.parent.parent.parent.parent / "packages" / "mistralai_gcp" / "src"
+sys.path.insert(0, str(gcp_package_path))
+
+from mistralai_gcp.sdk import GoogleCloudBeforeRequestHook
+
+def test_gcp_before_request_preserves_timeout_extension():
+    hook = GoogleCloudBeforeRequestHook(region="europe-west4", project_id="proj")
+
+    req = httpx.Request(
+        "POST",
+        "https://europe-west4-aiplatform.googleapis.com/v1/dummy",
+        content=b'{"model":"mistral-large-2407"}',
+        headers={"content-type": "application/json"},
+    )
+    timeout = httpx.Timeout(30.0)
+    req.extensions["timeout"] = timeout
+
+    out = hook.before_request(None, req)
+    assert isinstance(out, httpx.Request)
+    assert out.extensions.get("timeout") == timeout