diff --git a/helper/diffPlaces.js b/helper/diffPlaces.js
index d36ca92a3..2268888a8 100644
--- a/helper/diffPlaces.js
+++ b/helper/diffPlaces.js
@@ -149,6 +149,7 @@ function isAddressDifferent(item1, item2){
   // else both have address info
   if( isPropertyDifferent(address1, address2, 'number') ){ return true; }
   if( isPropertyDifferent(address1, address2, 'street') ){ return true; }
+  if( isPropertyDifferent(address1, address2, 'unit') ){ return true; }
 
   // only compare zip if both records have it, otherwise just ignore and assume it's the same
   // since by this time we've already compared parent hierarchies
@@ -213,9 +214,9 @@ function isPropertyDifferent(item1, item2, prop ){
  * ...
  * 11: locality
  * 13: neighbourhood
- * 
+ *
  * note: Infinity is returned if layer not found in array, this is in
- * order to ensure that a high value is returned rather than the 
+ * order to ensure that a high value is returned rather than the
  * default '-1' value returned for misses when using findIndex().
  */
 function getPlaceTypeRank(item) {
diff --git a/test/unit/helper/diffPlaces.js b/test/unit/helper/diffPlaces.js
index 890881d2b..85ae9fab7 100644
--- a/test/unit/helper/diffPlaces.js
+++ b/test/unit/helper/diffPlaces.js
@@ -335,6 +335,115 @@ module.exports.tests.dedupe = function(test, common) {
     t.false(isDifferent(item1, item2), 'should be the same');
     t.end();
   });
+
+  test('same address should be considered equal', function (t) {
+    var item1 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210'
+      }
+    };
+    var item2 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210'
+      }
+    };
+
+    t.false(isDifferent(item1, item2), 'should not be different');
+    t.end();
+  });
+
+  test('same address and unit should be considered equal', function (t) {
+    var item1 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210',
+        'unit': 'A'
+      }
+    };
+    var item2 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210',
+        'unit': 'A'
+      }
+    };
+
+    t.false(isDifferent(item1, item2), 'should not be different');
+    t.end();
+  });
+
+  test('same address but differing unit number should be considered different', function (t) {
+    var item1 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210',
+        'unit': 'A'
+      }
+    };
+    var item2 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210',
+        'unit': 'B'
+      }
+    };
+
+    t.true(isDifferent(item1, item2), 'should be different');
+    t.end();
+  });
+
+  test('same address but only one has unit number should be considered different', function (t) {
+    var item1 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210',
+        'unit': 'A'
+      }
+    };
+    var item2 = {
+      'name': {
+        'default': '1 Main St'
+      },
+      'address_parts': {
+        'number': '1',
+        'street': 'Main Street',
+        'zip': '90210'
+      }
+    };
+
+    t.true(isDifferent(item1, item2), 'should be different');
+    t.end();
+  });
 };
 
 module.exports.all = function (tape, common) {