diff --git a/cros_mark_as_stable.py b/cros_mark_as_stable.py
index e71813b022..2d9bd9e3af 100755
--- a/cros_mark_as_stable.py
+++ b/cros_mark_as_stable.py
@@ -282,7 +282,7 @@ class EBuildStableMarker(object):
       elif line.startswith('EAPI'):
         # Always add new commit_id after EAPI definition.
         redirect_file.write(line)
-        redirect_file.write('CROS_WORKON_COMMIT="%s"' % commit_id)
+        redirect_file.write('CROS_WORKON_COMMIT="%s"\n' % commit_id)
       elif not line.startswith('CROS_WORKON_COMMIT'):
         # Skip old CROS_WORKON_COMMIT definition.
         redirect_file.write(line)