1 files changed, 1 insertions, 1 deletions

diff --git a/meta/lib/oe/utils.py b/meta/lib/oe/utils.py
index 468c76f30f..9a2187e36f 100644
--- a/meta/lib/oe/utils.py
+++ b/meta/lib/oe/utils.py
@@ -193,7 +193,7 @@ def parallel_make(d, makeinst=False):
 
         return int(v)
 
-    return None
+    return ''
 
 def parallel_make_argument(d, fmt, limit=None, makeinst=False):
     """