diff --git a/src/array.js b/src/array.js
index 40e3a80a5..75ddd016b 100644
--- a/src/array.js
+++ b/src/array.js
@@ -138,7 +138,7 @@ inherits(ArraySchema, MixedSchema, {
   ensure() {
     return this
       .default([])
-      .transform(val => val != null ? [] : [].concat(val))
+      .transform(val => val == null ? [] : [].concat(val))
   },
 
   compact(rejector){
diff --git a/test/array.js b/test/array.js
index 5956645aa..0a4603840 100644
--- a/test/array.js
+++ b/test/array.js
@@ -102,7 +102,7 @@ describe('Array types', function(){
       await inst.isValid([7, 3]).should.become(false)
 
       let value = await inst.validate(['4', 3])
-      
+
       value.should.eql([4, 3])
     })
 
@@ -153,4 +153,14 @@ describe('Array types', function(){
     inst.compact(function(v){ return v == null })
       .cast(arr).should.eql(['', 1, 0, 4, false])
   })
+
+  it('should ensure arrays', function(){
+    var inst = array().ensure()
+
+    inst.cast([1, 4])
+      .should.eql([1, 4])
+
+    inst.cast(null)
+      .should.eql([])
+  })
 })