diff --git a/packages/component/package.json b/packages/component/package.json
index 954ab41a49..f6d2535cf7 100644
--- a/packages/component/package.json
+++ b/packages/component/package.json
@@ -67,7 +67,7 @@
     "precommit:eslint": "../../node_modules/.bin/eslint --report-unused-disable-directives --max-warnings 0",
     "precommit:typecheck": "tsc --project ./src --emitDeclarationOnly false --esModuleInterop true --noEmit --pretty false",
     "preversion": "cat package.json | jq '(.localDependencies // {} | to_entries | map([if .value == \"production\" then \"dependencies\" else \"devDependencies\" end, .key])) as $P | delpaths($P)' > package-temp.json && mv package-temp.json package.json",
-    "start": "npm run build -- --watch"
+    "start": "npm run build:tsup -- --watch"
   },
   "localDependencies": {
     "@msinternal/botframework-webchat-base": "development",
diff --git a/packages/fluent-theme/package.json b/packages/fluent-theme/package.json
index 6a52271a9c..9acacdee28 100644
--- a/packages/fluent-theme/package.json
+++ b/packages/fluent-theme/package.json
@@ -50,7 +50,7 @@
     "precommit:eslint": "../../node_modules/.bin/eslint --report-unused-disable-directives --max-warnings 0",
     "precommit:typecheck": "tsc --project ./src --emitDeclarationOnly false --esModuleInterop true --noEmit --pretty false",
     "preversion": "cat package.json | jq '(.localDependencies // {} | to_entries | map([if .value == \"production\" then \"dependencies\" else \"devDependencies\" end, .key])) as $P | delpaths($P)' > package-temp.json && mv package-temp.json package.json",
-    "start": "npm run build -- --watch"
+    "start": "npm run build:tsup -- --watch"
   },
   "localDependencies": {
     "@msinternal/botframework-webchat-tsconfig": "development",