diff --git a/Formula/wavpack.rb b/Formula/wavpack.rb
index b426009ec53..8d05765a1d6 100644
--- a/Formula/wavpack.rb
+++ b/Formula/wavpack.rb
@@ -17,7 +17,7 @@ class Wavpack < Formula
   end
 
   head do
-    url "https://github.com/dbry/WavPack.git"
+    url "https://github.com/dbry/WavPack.git", branch: "master"
     depends_on "autoconf" => :build
     depends_on "automake" => :build
     depends_on "libtool" => :build