diff --git a/underscore.js b/underscore.js
index b86ec8c49..63c111e1a 100644
--- a/underscore.js
+++ b/underscore.js
@@ -710,14 +710,21 @@
           timeout = setTimeout(later, wait - last);
         } else {
           timeout = null;
-          if (!immediate) result = func.apply(context, args);
+          if (!immediate) {
+            result = func.apply(context, args);
+            context = args = null;
+          }
         }
       };
       var callNow = immediate && !timeout;
       if (!timeout) {
         timeout = setTimeout(later, wait);
       }
-      if (callNow) result = func.apply(context, args);
+      if (callNow) {
+        result = func.apply(context, args);
+        context = args = null;
+      }
+
       return result;
     };
   };