diff --git a/protractor-shared.js b/protractor-shared.js
index 98d2c135b5..21ed44c631 100644
--- a/protractor-shared.js
+++ b/protractor-shared.js
@@ -6,8 +6,7 @@ var argv = require('yargs')
     .options({
       'sample-size': {
         describe: 'sample size',
-        default: 20,
-        type: 'boolean'
+        default: 20
       },
       'force-gc': {
         describe: 'force gc.',