diff --git a/core-modules/000QubesVm.py b/core-modules/000QubesVm.py
index 36d6b963..75bf69cd 100644
--- a/core-modules/000QubesVm.py
+++ b/core-modules/000QubesVm.py
@@ -614,7 +614,7 @@ class QubesVm(object):
 
         start_time = xs.read('', "/vm/%s/start_time" % str(uuid))
         if start_time != '':
-            return datetime.fromtimestamp(float(start_time))
+            return datetime.datetime.fromtimestamp(float(start_time))
         else:
             return None