diff --git a/build.sh b/build.sh
index c288f47..48346a9 100755
--- a/build.sh
+++ b/build.sh
@@ -10,13 +10,12 @@ fi
 # Get brew formula
 wget https://raw.githubusercontent.com/metacall/homebrew/main/metacall.rb
 
-export HOMEBREW_NO_AUTO_UPDATE=1
-
 # Build metacall brew recipe
+export HOMEBREW_NO_AUTO_UPDATE=1
 brew install --build-from-source --overwrite --verbose ./metacall.rb
 
 # Build distributable binary using brew pkg
-architecture() {
+function architecture() {
 	local arch=$(uname -m)
 
 	case ${arch} in
@@ -37,8 +36,8 @@ architecture() {
 METACALL_VERSION=`brew info metacall | grep -i "stable" | awk '{print $4}' | sed 's/.$//'`
 METACALL_ARCH=`architecture`
 
+brew tap --verbose metacall/brew-pkg
+brew install --verbose --HEAD metacall/brew-pkg/brew-pkg
 mkdir pkg && cd pkg
-wget https://raw.githubusercontent.com/metacall/brew-pkg/master/brew-pkg.rb
-brew install --build-from-source --overwrite --verbose ./brew-pkg.rb
 brew pkg --with-deps metacall
 mv metacall-${METACALL_VERSION}.pkg metacall-tarball-macos-${METACALL_ARCH}.pkg