diff --git a/api/account/account_api/endpoints/device.py b/api/account/account_api/endpoints/device.py
index ca9f51b7..d2382343 100644
--- a/api/account/account_api/endpoints/device.py
+++ b/api/account/account_api/endpoints/device.py
@@ -119,6 +119,11 @@ class DeviceEndpoint(SeleneEndpoint):
             else:
                 last_contact_age = datetime.utcnow() - device.last_contact_ts
         else:
+            last_contact_ts = last_contact_ts.decode()
+            last_contact_ts = datetime.strptime(
+                last_contact_ts,
+                '%Y-%m-%d %H:%M:%S.%f'
+            )
             last_contact_age = datetime.utcnow() - last_contact_ts
 
         return last_contact_age