diff --git a/packages/mistralai_azure/src/mistralai_azure/_hooks/custom_user_agent.py b/packages/mistralai_azure/src/mistralai_azure/_hooks/custom_user_agent.py
index 00bac95..2b71a96 100644
--- a/packages/mistralai_azure/src/mistralai_azure/_hooks/custom_user_agent.py
+++ b/packages/mistralai_azure/src/mistralai_azure/_hooks/custom_user_agent.py
@@ -5,18 +5,18 @@
 
 from .types import BeforeRequestContext, BeforeRequestHook
 
-prefix = "mistral-client-python/"
+PREFIX = "mistral-client-python/"
 
 class CustomUserAgentHook(BeforeRequestHook):
     def before_request(
         self, hook_ctx: BeforeRequestContext, request: httpx.Request
     ) -> Union[httpx.Request, Exception]:
         current = request.headers["user-agent"]
-        if current.startswith(prefix):
+        if current.startswith(PREFIX):
             return request
         
         request.headers["user-agent"] = (
-            prefix + current.split(" ")[1]
+            PREFIX + current.split(" ")[1]
         )
 
         return request
\ No newline at end of file
diff --git a/packages/mistralai_gcp/src/mistralai_gcp/_hooks/custom_user_agent.py b/packages/mistralai_gcp/src/mistralai_gcp/_hooks/custom_user_agent.py
index 6a7083d..77df6ae 100644
--- a/packages/mistralai_gcp/src/mistralai_gcp/_hooks/custom_user_agent.py
+++ b/packages/mistralai_gcp/src/mistralai_gcp/_hooks/custom_user_agent.py
@@ -5,18 +5,18 @@
 
 from .types import BeforeRequestContext, BeforeRequestHook
 
-prefix = "mistral-client-python/"
+PREFIX = "mistral-client-python/"
 
 class CustomUserAgentHook(BeforeRequestHook):
     def before_request(
         self, hook_ctx: BeforeRequestContext, request: httpx.Request
     ) -> Union[httpx.Request, Exception]:
         current = request.headers["user-agent"]
-        if current.startswith(prefix):
+        if current.startswith(PREFIX):
             return request
         
         request.headers["user-agent"] = (
-            prefix + current.split(" ")[1]
+            PREFIX + current.split(" ")[1]
         )
 
         return request
diff --git a/src/mistralai/_hooks/custom_user_agent.py b/src/mistralai/_hooks/custom_user_agent.py
index 29675c0..212f217 100644
--- a/src/mistralai/_hooks/custom_user_agent.py
+++ b/src/mistralai/_hooks/custom_user_agent.py
@@ -5,18 +5,18 @@
 
 from .types import BeforeRequestContext, BeforeRequestHook
 
-prefix = "mistral-client-python/"
+PREFIX = "mistral-client-python/"
 
 class CustomUserAgentHook(BeforeRequestHook):
     def before_request(
         self, hook_ctx: BeforeRequestContext, request: httpx.Request
     ) -> Union[httpx.Request, Exception]:
         current = request.headers["user-agent"]
-        if current.startswith(prefix):
+        if current.startswith(PREFIX):
             return request
         
         request.headers["user-agent"] = (
-            prefix + current.split(" ")[1]
+            PREFIX + current.split(" ")[1]
         )
 
         return request