diff --git a/bitbake/lib/bb/ui/knotty2.py b/bitbake/lib/bb/ui/knotty2.py
index aa6a4080e2..65e941b4c3 100644
--- a/bitbake/lib/bb/ui/knotty2.py
+++ b/bitbake/lib/bb/ui/knotty2.py
@@ -106,4 +106,4 @@ class TerminalFilter2(object):
             self.termios.tcsetattr(fd, self.termios.TCSADRAIN, self.stdinbackup)
 
 def main(server, eventHandler):
-    bb.ui.knotty.main(server, eventHandler, TerminalFilter2)
+    return bb.ui.knotty.main(server, eventHandler, TerminalFilter2)