diff --git a/Formula/silk.rb b/Formula/silk.rb
index 28918b26339..09f4e9ad124 100644
--- a/Formula/silk.rb
+++ b/Formula/silk.rb
@@ -16,7 +16,7 @@ class Silk < Formula
   depends_on "glib"
   depends_on "libfixbuf"
   depends_on "yaf"
-  depends_on :python => :optional
+  depends_on "python" => :optional
 
   def install
     args = %W[