diff --git a/applets/busybox.sh b/applets/busybox.sh
index 6b25dff3b..26d1376a0 100755
--- a/applets/busybox.sh
+++ b/applets/busybox.sh
@@ -9,7 +9,7 @@ RAW=` \
     | tr A-Z a-z | sort
 `
 test "${RAW}" != "" ||  exit
-if [ -d $BB_SRC_DIR ]; then cd $BB_SRC_DIR; fi
+if [ -d ${$BB_SRC_DIR:-.} ]; then cd $BB_SRC_DIR; fi
 # By running $RAW through "ls", we avoid listing
 # source files that don't exist.
 ls $RAW 2>/dev/null | tr '\n' ' '
diff --git a/busybox.sh b/busybox.sh
index 6b25dff3b..26d1376a0 100755
--- a/busybox.sh
+++ b/busybox.sh
@@ -9,7 +9,7 @@ RAW=` \
     | tr A-Z a-z | sort
 `
 test "${RAW}" != "" ||  exit
-if [ -d $BB_SRC_DIR ]; then cd $BB_SRC_DIR; fi
+if [ -d ${$BB_SRC_DIR:-.} ]; then cd $BB_SRC_DIR; fi
 # By running $RAW through "ls", we avoid listing
 # source files that don't exist.
 ls $RAW 2>/dev/null | tr '\n' ' '