diff --git a/agent/http.go b/agent/http.go
index 58c7a2c41a..7402ef5f95 100644
--- a/agent/http.go
+++ b/agent/http.go
@@ -608,7 +608,7 @@ func (s *HTTPServer) marshalJSON(req *http.Request, obj interface{}) ([]byte, er
 	if err != nil {
 		return nil, err
 	}
-	return buf, err
+	return buf, nil
 }
 
 // Returns true if the UI is enabled.