diff --git a/Formula/amber.rb b/Formula/amber.rb
index cfd6b84b0f..62723275c9 100644
--- a/Formula/amber.rb
+++ b/Formula/amber.rb
@@ -3,6 +3,7 @@ class Amber < Formula
   homepage "https://www.amberframework.org/"
   url "https://github.com/amberframework/amber/archive/v0.6.4.tar.gz"
   sha256 "4b7489d16afc26e2847d4dc74dad54d2f5dc20d1a148a5e0da6bea991bcac68f"
+  revision 1
 
   bottle do
     sha256 "b2f92639b17c291b2d69f5be394d71349ac4fca644f28c62d648f55c686a117f" => :high_sierra