diff --git a/sample-plugins/sample-namespace/plugin-a/package.json b/sample-plugins/sample-namespace/plugin-a/package.json
index 4f957e706740e..913ae192c3b0b 100644
--- a/sample-plugins/sample-namespace/plugin-a/package.json
+++ b/sample-plugins/sample-namespace/plugin-a/package.json
@@ -1,4 +1,5 @@
 {
+  "private": true,
   "name": "plugin-a",
   "version": "1.0.0",
   "main": "extension.js",
diff --git a/sample-plugins/sample-namespace/plugin-b/package.json b/sample-plugins/sample-namespace/plugin-b/package.json
index 1d2e86f009a7f..c4d956ba279ca 100644
--- a/sample-plugins/sample-namespace/plugin-b/package.json
+++ b/sample-plugins/sample-namespace/plugin-b/package.json
@@ -1,4 +1,5 @@
 {
+  "private": true,
   "name": "plugin-b",
   "version": "1.0.0",
   "main": "extension.js",