diff --git a/.changeset/thirty-dryers-listen.md b/.changeset/thirty-dryers-listen.md
new file mode 100644
index 000000000..62bc04a9c
--- /dev/null
+++ b/.changeset/thirty-dryers-listen.md
@@ -0,0 +1,5 @@
+---
+'@lion/button': patch
+---
+
+Add files that result in customElements.define to sideEffect so build tools don't tree shake them
diff --git a/packages/button/package.json b/packages/button/package.json
index 7b00893b1..ea93811a0 100644
--- a/packages/button/package.json
+++ b/packages/button/package.json
@@ -33,7 +33,10 @@
     "test": "cd ../../ && npm run test:browser -- --group button"
   },
   "sideEffects": [
-    "lion-button.js"
+    "lion-button.js",
+    "lion-button-reset.js",
+    "lion-button-submit.js",
+    "define.js"
   ],
   "dependencies": {
     "@lion/core": "0.18.2"