CB-5973 blackberry: use sync by default
diff --git a/src/blackberry10/exec.js b/src/blackberry10/exec.js
index c48ddff..5e0d8cb 100644
--- a/src/blackberry10/exec.js
+++ b/src/blackberry10/exec.js
@@ -118,9 +118,7 @@
             }
         }
 
-        sync = false || arguments[5];
-
-        if (!sync) {
+        if (sync !== undefined && !sync) {
             request.makeAsyncCall();
             return;
         }