diff --git a/tools/create_base_image_arm.sh b/tools/create_base_image_arm.sh
index 64133e9..262d427 100755
--- a/tools/create_base_image_arm.sh
+++ b/tools/create_base_image_arm.sh
@@ -14,6 +14,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
+
 source "${ANDROID_BUILD_TOP}/external/shflags/src/shflags"
 
 DEFINE_boolean p1 \
@@ -142,7 +144,6 @@
 find_script=if test -e mmc ${devnum}:${distro_bootpart} /boot/boot.scr; then echo Found U-Boot script /boot/boot.scr; run run_scr; fi
 run_scr=load mmc ${devnum}:${distro_bootpart} ${scriptaddr} /boot/boot.scr; source ${scriptaddr}
 EOF
-	script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 	echo "Sha=`${script_dir}/gen_sha.sh --kernel ${KERNEL_DIR}`" >> ${tmpfile}
 	${ANDROID_HOST_OUT}/bin/mkenvimage -s 32768 -o ${bootenv} - < ${tmpfile}
 fi