diff --git a/src/mcp/server/fastmcp/server.py b/src/mcp/server/fastmcp/server.py
index 956a8aa78..cf3981d4d 100644
--- a/src/mcp/server/fastmcp/server.py
+++ b/src/mcp/server/fastmcp/server.py
@@ -88,7 +88,7 @@ class Settings(BaseSettings, Generic[LifespanResultT]):
     mount_path: str = "/"  # Mount path (e.g. "/github", defaults to root path)
     sse_path: str = "/sse"
     message_path: str = "/messages/"
-    streamable_http_path: str = "/mcp"
+    streamable_http_path: str = "/"  # Mounting MCP under "/" (instead of "/mcp") to avoid nested "/mcp/mcp"
 
     # StreamableHTTP settings
     json_response: bool = False