diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index 872333d7fd..4c63b0baad 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -14,6 +14,7 @@ import simplediff
 from bb.checksum import FileChecksumCache
 from bb import runqueue
 import hashserv
+import hashserv.client
 
 logger = logging.getLogger('BitBake.SigGen')
 hashequiv_logger = logging.getLogger('BitBake.SigGen.HashEquiv')