diff --git a/composer.json b/composer.json
index 400af18..6fa45ea 100644
--- a/composer.json
+++ b/composer.json
@@ -49,10 +49,5 @@
         "psr-4": {
             "Amp\\ByteStream\\Test\\": "test"
         }
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "1.x-dev"
-        }
     }
 }