diff --git a/client/sse.go b/client/sse.go
index cf4a1028e..722b08ed4 100644
--- a/client/sse.go
+++ b/client/sse.go
@@ -93,6 +93,9 @@ func (c *SSEMCPClient) Start(ctx context.Context) error {
 	req.Header.Set("Accept", "text/event-stream")
 	req.Header.Set("Cache-Control", "no-cache")
 	req.Header.Set("Connection", "keep-alive")
+	for k, v := range c.headers {
+		req.Header.Set(k, v)
+	}
 
 	resp, err := c.httpClient.Do(req)
 	if err != nil {