diff --git a/packages/configs/default/index.json b/packages/configs/default/index.json
index 9d51a249c46..bda82bd3089 100644
--- a/packages/configs/default/index.json
+++ b/packages/configs/default/index.json
@@ -18,7 +18,7 @@
     "*.toml": ["@parcel/transformer-toml"],
     "*.webmanifest": ["@parcel/transformer-webmanifest"],
     "webmanifest:*.{json,webmanifest}": ["@parcel/transformer-webmanifest"],
-    "*.yaml": ["@parcel/transformer-yaml"],
+    "*.{yaml,yml}": ["@parcel/transformer-yaml"],
     "*.{glsl,vert,frag}": ["@parcel/transformer-glsl"],
     "*.{gql,graphql}": ["@parcel/transformer-graphql"],
     "*.{styl,stylus}": ["@parcel/transformer-stylus"],