diff --git a/packages/dropdown/package.json b/packages/dropdown/package.json
index 436be435538..1fef0b94de4 100644
--- a/packages/dropdown/package.json
+++ b/packages/dropdown/package.json
@@ -37,7 +37,8 @@
         "*.d.ts",
         "*.js",
         "*.js.map",
-        "/src/"
+        "/src/",
+        "/sync/"
     ],
     "sideEffects": [
         "./sp-dropdown.js",
diff --git a/packages/overlay/package.json b/packages/overlay/package.json
index bcb0a004cbb..afd71b33398 100644
--- a/packages/overlay/package.json
+++ b/packages/overlay/package.json
@@ -39,7 +39,8 @@
         "*.d.ts",
         "*.js",
         "*.js.map",
-        "/src/"
+        "/src/",
+        "/sync/"
     ],
     "sideEffects": [
         "./active-overlay.js",