diff --git a/rubocop-airbnb/lib/rubocop/cop/airbnb/spec_constant_assignment.rb b/rubocop-airbnb/lib/rubocop/cop/airbnb/spec_constant_assignment.rb
index 7e94de6..92ff742 100644
--- a/rubocop-airbnb/lib/rubocop/cop/airbnb/spec_constant_assignment.rb
+++ b/rubocop-airbnb/lib/rubocop/cop/airbnb/spec_constant_assignment.rb
@@ -33,7 +33,7 @@ class SpecConstantAssignment < Base
         def on_casgn(node)
           return unless in_spec_file?(node)
           parent_module_name = node.parent_module_name
-          if node.parent_module_name && parent_module_name != "Object"
+          if parent_module_name && parent_module_name != "Object"
             return
           end
           add_offense(node, message: MESSAGE)