diff --git a/build-system/tasks/vendor-configs.js b/build-system/tasks/vendor-configs.js
index 7db03019d64c..01c98c95cedc 100644
--- a/build-system/tasks/vendor-configs.js
+++ b/build-system/tasks/vendor-configs.js
@@ -39,7 +39,10 @@ async function vendorConfigs() {
 function compileVendorConfigs(opt_options) {
   const options = opt_options || {};
 
-  const srcPath = 'extensions/amp-analytics/0.1/vendors/*.json';
+  const srcPath = [
+    'extensions/amp-analytics/0.1/vendors/*.json',
+    '!extensions/amp-analytics/0.1/vendors/_fake_.json', // ignore test json
+  ];
   const destPath = 'dist/v0/analytics-vendors/';
 
   if (options.watch) {