diff --git a/update-makefiles.sh b/update-makefiles.sh
index d0cb91c..88cc97b 100755
--- a/update-makefiles.sh
+++ b/update-makefiles.sh
@@ -1,52 +1,8 @@
 #!/bin/bash
 
-if [ ! -d hardware/interfaces ] ; then
-  echo "Where is hardware/interfaces?";
-  exit 1;
-fi
+source system/tools/hidl/update-makefiles-helper.sh
 
-if [ ! -d system/libhidl/transport ] ; then
-  echo "Where is system/libhidl/transport?";
-  exit 1;
-fi
+do_makefiles_update \
+  "android.hardware:hardware/interfaces" \
+  "android.hidl:system/libhidl/transport"
 
-packages=$(pushd hardware/interfaces > /dev/null; \
-           find . -type f -name \*.hal -exec dirname {} \; | sort -u | \
-           cut -c3- | \
-           awk -F'/' \
-                '{printf("android.hardware"); for(i=1;i<NF;i++){printf(".%s", $i);}; printf("@%s\n", $NF);}'; \
-           popd > /dev/null)
-
-for p in $packages; do
-  echo "Updating $p";
-  hidl-gen -Lmakefile -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport $p;
-  rc=$?; if [[ $rc != 0 ]]; then exit $rc; fi
-  hidl-gen -Landroidbp -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport $p;
-  rc=$?; if [[ $rc != 0 ]]; then exit $rc; fi
-done
-
-# subdirectories of hardware/interfaces which contain an Android.bp file
-android_dirs=$(find hardware/interfaces/*/     \
-              -name "Android.bp"               \
-              -printf "%h\n"                   \
-              | cut -d "/" -f1-3               \
-              | sort | uniq)
-
-echo "Updating Android.bp files."
-
-for bp_dir in $android_dirs; do
-  bp="$bp_dir/Android.bp"
-  # locations of Android.bp files in specific subdirectory of hardware/interfaces
-  android_bps=$(find $bp_dir                   \
-                -name "Android.bp"             \
-                ! -path $bp_dir/Android.bp     \
-                -printf "%h\n"                 \
-                | sort)
-
-  echo "// This is an autogenerated file, do not edit." > "$bp";
-  echo "subdirs = [" >> "$bp";
-  for a in $android_bps; do
-    echo "    \"${a#$bp_dir/}\"," >> "$bp";
-  done
-  echo "]" >> "$bp";
-done