diff --git a/build.sh b/build.sh
index e2be155..d6e6978 100755
--- a/build.sh
+++ b/build.sh
@@ -63,13 +63,12 @@ main() {
   mkdir -p "$WORK_DIR"
 
   STAGE_DIR="$BASE_DIR/stage0"
-
-  pushd "$STAGE_DIR" > /dev/null
-
   STAGE=$(basename "$STAGE_DIR")
   STAGE_WORK_DIR="$WORK_DIR/$STAGE"
   ROOTFS_DIR="$STAGE_WORK_DIR/rootfs"
 
+  pushd "$STAGE_DIR" > /dev/null
+
   unmount "$STAGE_WORK_DIR"
 
   for SUB_STAGE_DIR in $STAGE_DIR/*; do