1 files changed, 5 insertions, 2 deletions

diff --git a/scripts/lib/devtool/standard.py b/scripts/lib/devtool/standard.py
index ec192238ed..fa9d347693 100644
--- a/scripts/lib/devtool/standard.py
+++ b/scripts/lib/devtool/standard.py
@@ -674,8 +674,11 @@ def _add_md5(config, recipename, filename):
 
     def addfile(fn):
         md5 = bb.utils.md5_file(fn)
-        with open(os.path.join(config.workspace_path, '.devtool_md5'), 'a') as f:
-            f.write('%s|%s|%s\n' % (recipename, os.path.relpath(fn, config.workspace_path), md5))
+        with open(os.path.join(config.workspace_path, '.devtool_md5'), 'a+') as f:
+            md5_str = '%s|%s|%s\n' % (recipename, os.path.relpath(fn, config.workspace_path), md5)
+            f.seek(0, os.SEEK_SET)
+            if not md5_str in f.read():
+                f.write(md5_str)
 
     if os.path.isdir(filename):
         for root, _, files in os.walk(filename):