diff --git a/helper/diffPlaces.js b/helper/diffPlaces.js
index 0094f212b..b12a3501f 100644
--- a/helper/diffPlaces.js
+++ b/helper/diffPlaces.js
@@ -157,6 +157,7 @@ function isAddressDifferent(item1, item2){
   if( !isPojo1 || !isPojo2 ){ return false; }
 
   // else both have address info
+  if( isPropertyDifferent(address1, address2, 'unit') ){ return true; }
   if( isPropertyDifferent(address1, address2, 'number') ){ return true; }
   if( isPropertyDifferent(address1, address2, 'street') ){ return true; }
 
diff --git a/test/unit/helper/diffPlaces.js b/test/unit/helper/diffPlaces.js
index 2304ad469..dc94f8674 100644
--- a/test/unit/helper/diffPlaces.js
+++ b/test/unit/helper/diffPlaces.js
@@ -438,6 +438,45 @@ module.exports.tests.dedupe = function(test, common) {
     t.end();
   });
 
+  test('same address, different unit number', function (t) {
+    var item1 = {
+      'address_parts': {
+        'unit': '1',
+        'number': '10',
+        'street': 'Main Street'
+      }
+    };
+    var item2 = {
+      'address_parts': {
+        'unit': '2',
+        'number': '10',
+        'street': 'Main Street'
+      }
+    };
+
+    t.true(isDifferent(item1, item2), 'should be different');
+    t.end();
+  });
+
+  test('same address, different one missing unit number', function (t) {
+    var item1 = {
+      'address_parts': {
+        'number': '10',
+        'street': 'Main Street'
+      }
+    };
+    var item2 = {
+      'address_parts': {
+        'unit': '2',
+        'number': '10',
+        'street': 'Main Street'
+      }
+    };
+
+    t.true(isDifferent(item1, item2), 'should be different');
+    t.end();
+  });
+
   test('completely empty objects', function(t) {
     var item1 = {};
     var item2 = {};