diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index 2c8283a65a..7b19f519b7 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -38,7 +38,7 @@ then
   HOMEBREW_DEFAULT_LOGS="${HOME}/Library/Logs/Homebrew"
   HOMEBREW_DEFAULT_TEMP="/private/tmp"
 else
-  CACHE_HOME="${XDG_CACHE_HOME:-${HOME}/.cache}"
+  CACHE_HOME="${HOMEBREW_XDG_CACHE_HOME:-${HOME}/.cache}"
   HOMEBREW_DEFAULT_CACHE="${CACHE_HOME}/Homebrew"
   HOMEBREW_DEFAULT_LOGS="${CACHE_HOME}/Homebrew/Logs"
   HOMEBREW_DEFAULT_TEMP="/tmp"
diff --git a/bin/brew b/bin/brew
index f5304144d7..f0231165d6 100755
--- a/bin/brew
+++ b/bin/brew
@@ -157,6 +157,7 @@ USED_BY_HOMEBREW_VARS=(
   SSH_TTY
   SUDO_USER
   TMUX
+  XDG_CACHE_HOME
   XDG_RUNTIME_DIR
 )
 for VAR in "${USED_BY_HOMEBREW_VARS[@]}"