diff --git a/bin/utils.js b/bin/utils.js
index 1664397bc..16d56da9a 100644
--- a/bin/utils.js
+++ b/bin/utils.js
@@ -8,7 +8,7 @@ function getFilesFromArgs( args ) {
 
   // Default to files in the test directory
   if ( !globs.length ) {
-    globs.push( "test/*.js" );
+    globs.push( "test/**/*.js" );
   }
 
   // For each of the potential globs, we check if it is a directory path and
@@ -17,7 +17,7 @@ function getFilesFromArgs( args ) {
     let stat = existsStat( glob );
 
     if ( stat && stat.isDirectory() ) {
-      return `${glob}/*.js`;
+      return `${glob}/**/*.js`;
     } else {
       return glob;
     }