diff --git a/build/build.plugin.zsh b/build/build.plugin.zsh
index bcad7aa..da07bac 100644
--- a/build/build.plugin.zsh
+++ b/build/build.plugin.zsh
@@ -125,6 +125,7 @@ EOF
   alias build="$build"
   hash -d build=$local_build_dir
   export build_dir=$local_build_dir
+  export BUILD_DIR=$PWD/$local_build_dir
 
   # If `--build` is specified then evaluate the command.
   if [[ -n $do_build ]]; then