diff --git a/tools/releasetools/build_image.py b/tools/releasetools/build_image.py
index 3726df6..301d0da 100755
--- a/tools/releasetools/build_image.py
+++ b/tools/releasetools/build_image.py
@@ -73,9 +73,9 @@
   """
   cmd = ["find", path, "-print"]
   output = common.RunAndCheckOutput(cmd, verbose=False)
-  # increase by > 4% as number of files and directories is not whole picture.
+  # increase by > 6% as number of files and directories is not whole picture.
   inodes = output.count('\n')
-  spare_inodes = inodes * 4 // 100
+  spare_inodes = inodes * 6 // 100
   min_spare_inodes = 12
   if spare_inodes < min_spare_inodes:
     spare_inodes = min_spare_inodes