diff --git a/services/sync/modules/service.js b/services/sync/modules/service.js
index dc9520be1385..eb9868907d93 100644
--- a/services/sync/modules/service.js
+++ b/services/sync/modules/service.js
@@ -514,7 +514,7 @@ WeaveSvc.prototype = {
       engine.sync(self.cb);
       yield;
     } catch(e) {
-      this._log.error(e.toString());
+      this._log.error(Utils.exceptionStr(e));
     }
   },