diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index 39789ea30f..d64af6a9c9 100644
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -190,7 +190,7 @@ def srctree_hash_files(d, srcdir=None):
             # Update our custom index
             env = os.environ.copy()
             env['GIT_INDEX_FILE'] = tmp_index.name
-            subprocess.check_output(['git', 'add', '.'], cwd=s_dir, env=env)
+            subprocess.check_output(['git', 'add', '-A', '.'], cwd=s_dir, env=env)
             sha1 = subprocess.check_output(['git', 'write-tree'], cwd=s_dir, env=env).decode("utf-8")
         with open(oe_hash_file, 'w') as fobj:
             fobj.write(sha1)