diff --git a/Formula/randomize-lines.rb b/Formula/randomize-lines.rb
index aa237a4b38b..a0d03d67ebf 100644
--- a/Formula/randomize-lines.rb
+++ b/Formula/randomize-lines.rb
@@ -19,6 +19,6 @@ class RandomizeLines < Formula
   end
 
   test do
-    system "echo -e \"1\n2\n4\" | \"#{bin}/rl\" -c 1"
+    system system "echo", "-e", "\" ""1\n2\n4\" | \"#{bin}/rl\" -c 1"
   end
 end