2 files changed, 3 insertions, 3 deletions
diff --git a/services/sync/modules/record.js b/services/sync/modules/record.js
index 02f7f281a1..f7a69d9ef1 100644
--- a/services/sync/modules/record.js
+++ b/services/sync/modules/record.js
@@ -43,7 +43,7 @@ WBORecord.prototype = {
   // Get thyself from your URI, then deserialize.
   // Set thine 'response' field.
   fetch: function fetch(resource) {
-    if (!resource instanceof Resource) {
+    if (!(resource instanceof Resource)) {
       throw new Error("First argument must be a Resource instance.");
     }
 
@@ -56,7 +56,7 @@ WBORecord.prototype = {
   },
 
   upload: function upload(resource) {
-    if (!resource instanceof Resource) {
+    if (!(resource instanceof Resource)) {
       throw new Error("First argument must be a Resource instance.");
     }
 
diff --git a/services/sync/modules/service.js b/services/sync/modules/service.js
index b0eb0f41d6..5c91323b51 100644
--- a/services/sync/modules/service.js
+++ b/services/sync/modules/service.js
@@ -455,7 +455,7 @@ Sync11Service.prototype = {
     this.clientsEngine = new ClientEngine(this);
 
     for (let name of engines) {
-      if (!name in ENGINE_MODULES) {
+      if (!(name in ENGINE_MODULES)) {
         this._log.info("Do not know about engine: " + name);
         continue;
       }