diff --git a/Formula/acme.rb b/Formula/acme.rb
index b717a0240e..45c5a0a9db 100644
--- a/Formula/acme.rb
+++ b/Formula/acme.rb
@@ -29,7 +29,7 @@ class Acme < Formula
 
   test do
     path = testpath/"a.asm"
-    path.write <<-EOS
+    path.write <<~EOS
       !to "a.out", cbm
       * = $c000
       jmp $fce2