diff --git a/Formula/macaulay2-common.rb b/Formula/macaulay2-common.rb
index c9e771f..05c420a 100644
--- a/Formula/macaulay2-common.rb
+++ b/Formula/macaulay2-common.rb
@@ -26,7 +26,7 @@ def install
     # but brew requires at least one url, so I gave it one.
     mv buildpath/"1.23/share", prefix
     mv buildpath/"1.23/lib",   prefix
-    rm_rf share/"emacs"
+    rm_r share/"emacs"
   end
 
   def post_install