diff --git a/bin/brew-cask b/bin/brew-cask
index 110785e42c..c97dc3fcd6 100755
--- a/bin/brew-cask
+++ b/bin/brew-cask
@@ -99,7 +99,7 @@ find_ruby_2_plus () {
     else
         IFS=$'\n' rubies=( $(/usr/bin/type -aP ruby)   \
                            "/usr/local/bin/ruby"       \
-                           "$(brew --prefix 2>/dev/null)/bin/ruby" )
+                           "$(brew --repository 2>/dev/null)/bin/ruby" )
         for ruby in "${rubies[@]}"; do
             version_str="$("$ruby" --version 2>/dev/null)"
             if [[ "$version_str" =~ ^ruby.2 ]]; then
diff --git a/brew-cask.rb b/brew-cask.rb
index 12ad303f81..db910ebb63 100644
--- a/brew-cask.rb
+++ b/brew-cask.rb
@@ -23,7 +23,7 @@ class Ruby20Requirement < Requirement
       rubies = `/usr/bin/type -aP ruby`.split("\n")
       rubies += [
         "/usr/local/bin/ruby",
-        "#{`brew --prefix 2>/dev/null`.strip}/bin/ruby",
+        "#{`brew --repository 2>/dev/null`.strip}/bin/ruby",
       ]
 
       rubies.uniq.each do |ruby|
diff --git a/developer/bin/develop_brew_cask b/developer/bin/develop_brew_cask
index 5c828b31e4..b8e3877138 100755
--- a/developer/bin/develop_brew_cask
+++ b/developer/bin/develop_brew_cask
@@ -120,10 +120,10 @@ _main () {
     # initialization
     cd_to_project_root
     local git_root="$(/bin/pwd)"
-    local brew_prefix="$(brew --prefix)"
-    local cellar_dir="$brew_prefix/Cellar/brew-cask"
+    local brew_repository="$(brew --repository)"
+    local cellar_dir="$brew_repository/Cellar/brew-cask"
     local version_dir="$(/bin/ls -- "$cellar_dir/" | /usr/bin/sort | /usr/bin/tail -1)"
-    local tap_dir="$brew_prefix/$tap_subdir"
+    local tap_dir="$brew_repository/$tap_subdir"
 
     # sanity check
     not_inside_homebrew "$tap_dir" "$git_root"