diff --git a/lib/flatware/cli.rb b/lib/flatware/cli.rb
index 6283b1e..efef951 100644
--- a/lib/flatware/cli.rb
+++ b/lib/flatware/cli.rb
@@ -41,7 +41,9 @@ def fan(*command)
           exec({ 'TEST_ENV_NUMBER' => i.to_s }, command)
         end
       end
-      Process.waitall
+      children = Process.waitall
+      success = children.all? { |pid, status| status.success? }
+      exit success ? 0 : 1
     end
 
     desc 'clear', 'kills all flatware processes'