diff --git a/designate/manage/pool.py b/designate/manage/pool.py
index 7d11777cf..57860608e 100644
--- a/designate/manage/pool.py
+++ b/designate/manage/pool.py
@@ -51,8 +51,13 @@ class PoolCommands(base.Commands):
             masters = []
             for target in pool.targets:
                 for master in target.get("masters", []):
-                    masters.append({'host': master['host'],
-                                    'port': master['port']})
+                    master = {'host': master['host'], 'port': master['port']}
+                    found = False
+                    for existing_master in masters:
+                        if master == existing_master:
+                            found = True
+                    if not found:
+                        masters.append(master)
             return masters
 
         policy.init()
diff --git a/designate/tests/test_manage/test_update_pool.py b/designate/tests/test_manage/test_update_pool.py
index d5b21fbcd..1e9320bea 100644
--- a/designate/tests/test_manage/test_update_pool.py
+++ b/designate/tests/test_manage/test_update_pool.py
@@ -26,11 +26,11 @@ class UpdatePoolTestCase(DesignateManageTestCase):
         self.stdlog = fixtures.StandardLogging()
         self.useFixture(self.stdlog)
 
-    def hydrate_pool_targets(self, targets):
+    def hydrate_pool_targets(self, target_masters):
         pool_targets = objects.PoolTargetList()
         masters = objects.PoolTargetMasterList()
-        for target in targets:
-            masters.append(target)
+        for target_master in target_masters:
+            masters.append(target_master)
         target = objects.PoolTarget(masters=masters)
         target.masters = masters
         pool_targets.append(target)
@@ -63,3 +63,38 @@ class UpdatePoolTestCase(DesignateManageTestCase):
                                "update_zone") as mock_update_zone:
             command._update_zones(pool)
             mock_update_zone.assert_called_once()
+
+    def test_update_pools_zones_multiple_masters(self):
+        values = dict(
+            name='example.com.',
+            email='info@example.com',
+            type='PRIMARY'
+        )
+
+        zone = self.central_service.create_zone(
+            self.admin_context, zone=objects.Zone.from_dict(values))
+
+        # Ensure the correct NS Records are in place
+        pool = self.central_service.get_pool(
+            self.admin_context, zone.pool_id)
+
+        targets1 = self.hydrate_pool_targets([
+            objects.PoolTargetMaster(
+                  pool_target_id=pool.id,
+                  host="127.0.0.1",
+                  port="53")
+        ])
+        targets2 = self.hydrate_pool_targets([
+            objects.PoolTargetMaster(
+                  pool_target_id=pool.id,
+                  host="127.0.0.1",
+                  port="53")
+        ])
+        pool.targets = objects.PoolTargetList()
+        pool.targets.extend(targets1.objects + targets2.objects)
+
+        command = PoolCommands()
+        command.context = self.admin_context
+        command.central_api = self.central_service
+
+        command._update_zones(pool)