diff --git a/build/build.plugin.zsh b/build/build.plugin.zsh
index 2688f7d..5a1510b 100644
--- a/build/build.plugin.zsh
+++ b/build/build.plugin.zsh
@@ -33,7 +33,7 @@ build-dir() {
   python $_build_dir_py $file;
   local error=$?
   # If the file exists, read the build directory from it, then delete it.
-  [ -f $file ] && build_dir=$PWD/`cat $file`; rm $file
+  [ -f $file ] && local build_dir=$PWD/`cat $file`; rm $file
   # If choosing a build directory failed, return that error.
   [[ "$error" = "0" ]] || return $error
   # If `build.ninja` exists in alias `ninja`, return.
@@ -59,14 +59,14 @@ build-dir() {
   [[ "$1" = "--build" ]] && eval $build || true
 }
 
-# Build then run a target residing in `$build_dir/bin`.
+# Build then run a target residing in `~build/bin`.
 build-run() {
   local target=$1; shift 1
-  build $target && $build_dir/bin/$target $*
+  eval build $target && ~build/bin/$target $*
 }
 
-# Build then debug a target residing in `$build_dir/bin`.
+# Build then debug a target residing in `~build/bin`.
 build-debug() {
   local target=$1; shift 1
-  build $target && debug $build_dir/bin/$target $*
+  eval build $target && debug ~build/bin/$target $*
 }