diff --git a/semantic_router/index/pinecone.py b/semantic_router/index/pinecone.py
index dd0ac6711766e95182e8b36aeb05c80c7a8527f5..60ada2e3767b92750706c1ab191674b79f2c39db 100644
--- a/semantic_router/index/pinecone.py
+++ b/semantic_router/index/pinecone.py
@@ -654,7 +654,7 @@ class PineconeIndex(BaseIndex):
         }
 
         if self.namespace:
-            params["namespace"] = self.namespace
+            params["namespace"] = [self.namespace]
 
         headers = {
             "Api-Key": self.api_key,