diff --git a/.changeset/smart-donuts-teach.md b/.changeset/smart-donuts-teach.md
new file mode 100644
index 0000000000..f258dee394
--- /dev/null
+++ b/.changeset/smart-donuts-teach.md
@@ -0,0 +1,5 @@
+---
+'@backstage/ui': patch
+---
+
+Enable tree-shaking of imports other than `*.css`.
diff --git a/packages/ui/package.json b/packages/ui/package.json
index 1f57bfc848..caf88a08ca 100644
--- a/packages/ui/package.json
+++ b/packages/ui/package.json
@@ -19,7 +19,9 @@
     "directory": "packages/ui"
   },
   "license": "Apache-2.0",
-  "sideEffects": true,
+  "sideEffects": [
+    "*.css"
+  ],
   "main": "src/index.ts",
   "types": "src/index.ts",
   "files": [