diff --git a/build.js b/build.js
index d87c45dfd..83aff373f 100755
--- a/build.js
+++ b/build.js
@@ -79,7 +79,7 @@
     'countBy': ['forEach', 'identity', 'isEqual', 'keys'],
     'debounce': [],
     'defaults': ['isArray', 'forEach', 'forOwn'],
-    'defer': [],
+    'defer': ['bind'],
     'delay': [],
     'difference': ['indexOf'],
     'escape': [],
@@ -1526,8 +1526,8 @@
         useUnderscoreClone = methods.indexOf('clone') < 0;
       }
       // update dependencies
-      if (isModern || isUnderscore) {
-        dependencyMap.reduceRight = _.without(dependencyMap.reduceRight, 'isEqual', 'isString');
+      if (isLegacy) {
+        dependencyMap.defer = _.without(dependencyMap.defer, 'bind');
       }
       if (isUnderscore) {
         dependencyMap.contains = _.without(dependencyMap.contains, 'isString');
@@ -1555,6 +1555,9 @@
           dependencyMap.clone = _.without(dependencyMap.clone, 'forEach', 'forOwn');
         }
       }
+      if (isModern || isUnderscore) {
+        dependencyMap.reduceRight = _.without(dependencyMap.reduceRight, 'isEqual', 'isString');
+      }
 
       // add method names explicitly
       if (includeMethods.length) {
diff --git a/test/test-build.js b/test/test-build.js
index 11f76e73a..6cc65d19c 100644
--- a/test/test-build.js
+++ b/test/test-build.js
@@ -1200,6 +1200,7 @@
       'include=once plus=bind,Chaining',
       'category=collections,functions',
       'backbone legacy category=utilities minus=first,last',
+      'legacy include=defer',
       'underscore include=debounce,throttle plus=after minus=throttle',
       'underscore mobile strict category=functions exports=amd,global plus=pick,uniq',
     ]
@@ -1214,13 +1215,13 @@
         var command = origCommand;
 
         if (index == 1) {
-          if (/mobile/.test(command)) {
+          if (/legacy|mobile/.test(command)) {
             return;
           }
           command = 'mobile ' + command;
         }
         if (index == 2) {
-          if (/modern/.test(command)) {
+          if (/legacy|modern/.test(command)) {
             return;
           }
           command = 'modern ' + command;