diff --git a/scripts/lib/devtool/standard.py b/scripts/lib/devtool/standard.py
index 7972b4f8223..7f32b0999a4 100644
--- a/scripts/lib/devtool/standard.py
+++ b/scripts/lib/devtool/standard.py
@@ -1885,6 +1885,8 @@ def _update_recipe(recipename, workspace, rd, mode, appendlayerdir, wildcard_ver
         for line in stdout.splitlines():
             branchname = line[2:]
             if line.startswith('* '):
+                if 'HEAD' in line:
+                    raise DevtoolError('Detached HEAD - please check out the main branch in source tree first')
                 startbranch = branchname
             if branchname.startswith(override_branch_prefix):
                 override_branches.append(branchname)