diff --git a/core/Makefile b/core/Makefile
index 5cd2fe4..7628c8c 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -1187,11 +1187,11 @@
 # so that we can get the size stat even if the build fails due to too large
 # system image.
 INSTALLED_FILES_FILE := $(PRODUCT_OUT)/installed-files.txt
-$(INSTALLED_FILES_FILE): $(FULL_SYSTEMIMAGE_DEPS)
+$(INSTALLED_FILES_FILE): $(FULL_SYSTEMIMAGE_DEPS) $(FILESLIST)
 	@echo Installed file list: $@
 	@mkdir -p $(dir $@)
 	@rm -f $@
-	$(hide) build/tools/fileslist.py $(TARGET_OUT) > $(@:.txt=.json)
+	$(hide) $(FILESLIST) $(TARGET_OUT) > $(@:.txt=.json)
 	$(hide) build/tools/fileslist_util.py -c $(@:.txt=.json) > $@
 
 .PHONY: installed-file-list
@@ -1634,11 +1634,11 @@
       $(ALL_PDK_FUSION_FILES))
 
 INSTALLED_FILES_FILE_SYSTEMOTHER := $(PRODUCT_OUT)/installed-files-system-other.txt
-$(INSTALLED_FILES_FILE_SYSTEMOTHER) : $(INTERNAL_SYSTEMOTHERIMAGE_FILES)
+$(INSTALLED_FILES_FILE_SYSTEMOTHER) : $(INTERNAL_SYSTEMOTHERIMAGE_FILES) $(FILESLIST)
 	@echo Installed file list: $@
 	@mkdir -p $(dir $@)
 	@rm -f $@
-	$(hide) build/tools/fileslist.py $(TARGET_OUT_SYSTEM_OTHER) > $(@:.txt=.json)
+	$(hide) $(FILESLIST) $(TARGET_OUT_SYSTEM_OTHER) > $(@:.txt=.json)
 	$(hide) build/tools/fileslist_util.py -c $(@:.txt=.json) > $@
 
 systemotherimage_intermediates := \
@@ -1681,11 +1681,11 @@
 $(INSTALLED_PLATFORM_ZIP) : $(INTERNAL_VENDORIMAGE_FILES)
 
 INSTALLED_FILES_FILE_VENDOR := $(PRODUCT_OUT)/installed-files-vendor.txt
-$(INSTALLED_FILES_FILE_VENDOR) : $(INTERNAL_VENDORIMAGE_FILES)
+$(INSTALLED_FILES_FILE_VENDOR) : $(INTERNAL_VENDORIMAGE_FILES) $(FILESLIST)
 	@echo Installed file list: $@
 	@mkdir -p $(dir $@)
 	@rm -f $@
-	$(hide) build/tools/fileslist.py $(TARGET_OUT_VENDOR) > $(@:.txt=.json)
+	$(hide) $(FILESLIST) $(TARGET_OUT_VENDOR) > $(@:.txt=.json)
 	$(hide) build/tools/fileslist_util.py -c $(@:.txt=.json) > $@
 
 vendorimage_intermediates := \
diff --git a/core/config.mk b/core/config.mk
index 319a069..9c93240 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -497,6 +497,7 @@
 
 SOONG_ZIP := $(SOONG_HOST_OUT_EXECUTABLES)/soong_zip
 ZIP2ZIP := $(SOONG_HOST_OUT_EXECUTABLES)/zip2zip
+FILESLIST := $(SOONG_HOST_OUT_EXECUTABLES)/fileslist
 
 JAVAC_FILTER := $(SOONG_HOST_OUT_EXECUTABLES)/soong_javac_filter
 
diff --git a/tools/fileslist.py b/tools/fileslist.py
deleted file mode 100755
index b9e7350..0000000
--- a/tools/fileslist.py
+++ /dev/null
@@ -1,58 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright (C) 2009 The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the 'License');
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an 'AS IS' BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-import json, hashlib, operator, os, sys
-
-def get_file_size(path):
-  st = os.lstat(path)
-  return st.st_size;
-
-def get_file_digest(path):
-  if os.path.isfile(path) == False:
-    return "----------------------------------------------------------------"
-  digest = hashlib.sha256()
-  with open(path, 'rb') as f:
-    while True:
-      buf = f.read(1024*1024)
-      if not buf:
-        break
-      digest.update(buf)
-  return digest.hexdigest();
-
-def main(argv):
-  output = []
-  roots = argv[1:]
-  for root in roots:
-    base = len(root[:root.rfind(os.path.sep)])
-    for dir, dirs, files in os.walk(root):
-      relative = dir[base:]
-      for f in files:
-        try:
-          path = os.path.sep.join((dir, f))
-          row = {
-              "Size": get_file_size(path),
-              "Name": os.path.sep.join((relative, f)),
-              "SHA256": get_file_digest(path),
-            }
-          output.append(row)
-        except os.error:
-          pass
-  output.sort(key=operator.itemgetter("Size", "Name"), reverse=True)
-  print json.dumps(output, indent=2, separators=(',',': '))
-
-if __name__ == '__main__':
-  main(sys.argv)