diff --git a/lib/dm-core/collection.rb b/lib/dm-core/collection.rb
index b00a7daf..a6ec95d3 100644
--- a/lib/dm-core/collection.rb
+++ b/lib/dm-core/collection.rb
@@ -65,9 +65,9 @@ def model
     # @return [self]
     #
     # @api public
-    def reload(other_query = nil)
+    def reload(other_query = Undefined)
       query = self.query
-      query = other_query.nil? ? query.dup : query.merge(other_query)
+      query = other_query.equal?(Undefined) ? query.dup : query.merge(other_query)
 
       # make sure the Identity Map contains all the existing resources
       identity_map = repository.identity_map(model)