diff --git a/build.js b/build.js
index ad07ea34e..4faf7e494 100755
--- a/build.js
+++ b/build.js
@@ -1095,6 +1095,26 @@
     return source.replace(getCreateObjectFallback(source), '');
   }
 
+  /**
+   * Removes the binding optimization from `source`.
+   *
+   * @private
+   * @param {String} source The source to process.
+   * @returns {String} Returns the modified source.
+   */
+  function removeBindingOptimization(source) {
+    source = removeVar(source, 'fnToString');
+    source = removeVar(source, 'reThis');
+
+    // remove `reThis` from `createCallback`
+    source = source.replace(matchFunction(source, 'createCallback'), function(match) {
+      return match.replace(/\s*\|\|\s*\(reThis[\s\S]+?\)\)\)/, '');
+    });
+
+    return source;
+  }
+
+
   /**
    * Removes the `Object.keys` object iteration optimization from `source`.
    *
@@ -1270,7 +1290,7 @@
     // remove `support.nonEnumArgs` from `_.keys`
     source = source.replace(matchFunction(source, 'keys'), function(match) {
       return match
-        .replace(/(?:\s*\|\|\s*)?\(support\.nonEnumArgs[^)]+\)\)/, '')
+        .replace(/(?:\s*\|\|\s*)?\(support\.nonEnumArgs[\s\S]+?\)\)/, '')
         .replace(/\s*if *\(\s*\)[^}]+}/, '');
     });
 
@@ -2044,6 +2064,9 @@
           ].join('\n'));
         }
       }
+      if (isLegacy || isMobile || isUnderscore) {
+        source = removeBindingOptimization(source);
+      }
       if (isMobile || isUnderscore) {
         source = removeKeysOptimization(source);
         source = removeSetImmediate(source);
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 9fc89d6a2..625d5b051 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -56,9 +56,6 @@
   /** Used to match "interpolate" template delimiters */
   var reInterpolate = /<%=([\s\S]+?)%>/g;
 
-  /** Used to detect functions containing a `this` reference */
-  var reThis = (reThis = /\bthis\b/) && reThis.test(function() { return this; }) && reThis;
-
   /** Used to ensure capturing order of template delimiters */
   var reNoMatch = /($^)/;
 
@@ -126,7 +123,6 @@
       clearTimeout = window.clearTimeout,
       concat = arrayProto.concat,
       floor = Math.floor,
-      fnToString = Function.prototype.toString,
       hasOwnProperty = objectProto.hasOwnProperty,
       push = arrayProto.push,
       propertyIsEnumerable = objectProto.propertyIsEnumerable,
@@ -3481,7 +3477,7 @@
         return result;
       };
     }
-    if (typeof thisArg == 'undefined' || (reThis && !reThis.test(fnToString.call(func)))) {
+    if (typeof thisArg == 'undefined') {
       return func;
     }
     if (argCount === 1) {
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 2e4e04309..3df50eeb5 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,32 +4,32 @@
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  * Underscore.js 1.4.4 underscorejs.org/LICENSE
  */
-;!function(n){function t(n){return n instanceof t?n:new a(n)}function r(n,t){var r=n.b,e=t.b;if(n=n.a,t=t.a,n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return r<e?-1:1}function e(n,t,r,e){function o(){var e=arguments,c=a?this:t;return i||(n=t[f]),r.length&&(e=e.length?(e=Rt.call(e),l?e.concat(r):r.concat(e)):r),this instanceof o?(c=u(n.prototype),e=n.apply(c,e),_(e)?e:c):n.apply(c,e)}var i=m(n),a=!r,f=t;if(a){var l=e;r=t}else if(!i){if(!e)throw new TypeError;
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