diff --git a/.changeset/dry-dolls-run.md b/.changeset/dry-dolls-run.md
new file mode 100644
index 0000000000..423d14d044
--- /dev/null
+++ b/.changeset/dry-dolls-run.md
@@ -0,0 +1,5 @@
+---
+'@backstage/cli': patch
+---
+
+Use consistent file extensions for JS output when building packages.