diff --git a/meta/classes/externalsrc.bbclass b/meta/classes/externalsrc.bbclass
index 3d6b80bee2..0401c75fa9 100644
--- a/meta/classes/externalsrc.bbclass
+++ b/meta/classes/externalsrc.bbclass
@@ -217,7 +217,7 @@ def srctree_hash_files(d, srcdir=None):
             env['GIT_INDEX_FILE'] = tmp_index.name
             subprocess.check_output(['git', 'add', '-A', '.'],
cwd=s_dir, env=env)
             git_sha1 = subprocess.check_output(['git', 'write-tree'],
cwd=s_dir, env=env).decode("utf-8")
-            submodule_helper = subprocess.check_output(['git',
'submodule--helper', 'list'], cwd=s_dir, env=env).decode("utf-8")
+            submodule_helper = subprocess.check_output(['git',