1 files changed, 2 insertions, 2 deletions

diff --git a/scripts/lib/recipetool/append.py b/scripts/lib/recipetool/append.py
index 3f2f9a4f4f..ed7d0d4b27 100644
--- a/scripts/lib/recipetool/append.py
+++ b/scripts/lib/recipetool/append.py
@@ -337,7 +337,7 @@ def appendfile(args):
         return 3
 
 
-def appendsrc(args, files, rd):
+def appendsrc(args, files, rd, extralines=None):
     import oe.recipeutils
 
     srcdir = rd.getVar('S', True)
@@ -352,7 +352,7 @@ def appendsrc(args, files, rd):
         simplified[str(simple_uri)] = uri
 
     copyfiles = {}
-    extralines = []
+    extralines = extralines or []
     for newfile, srcfile in files.iteritems():
         src_destdir = os.path.dirname(srcfile)
         if not args.use_workdir: