diff --git a/girder_worker/app.py b/girder_worker/app.py
index 95de4ea2..ceab5409 100644
--- a/girder_worker/app.py
+++ b/girder_worker/app.py
@@ -35,6 +35,9 @@
 )
 
 import jsonpickle
+import jsonpickle.ext.numpy as jsonpickle_numpy
+jsonpickle_numpy.register_handlers()
+
 from kombu.serialization import register
 
 import six