diff --git a/google/genai/_api_client.py b/google/genai/_api_client.py
index 3028c72a2..8049181f7 100644
--- a/google/genai/_api_client.py
+++ b/google/genai/_api_client.py
@@ -538,6 +538,13 @@ def __del__(self) -> None:
 class BaseApiClient:
   """Client for calling HTTP APIs sending and receiving JSON."""
 
+  ## Set GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES to false
+  ## to disable bound token sharing. Tracking on
+  ## https://github.com/googleapis/python-genai/issues/1956
+  os.environ['GOOGLE_API_PREVENT_AGENT_TOKEN_SHARING_FOR_GCP_SERVICES'] = (
+      'false'
+  )
+
   def __init__(
       self,
       vertexai: Optional[bool] = None,