diff --git a/lib/synvert/core/rewriter/condition/if_exist_condition.rb b/lib/synvert/core/rewriter/condition/if_exist_condition.rb
index 60117f48..3e76c83c 100644
--- a/lib/synvert/core/rewriter/condition/if_exist_condition.rb
+++ b/lib/synvert/core/rewriter/condition/if_exist_condition.rb
@@ -8,7 +8,7 @@ class Rewriter::IfExistCondition < Rewriter::Condition
     def match?
       match = false
       @instance.current_node.recursive_children do |child_node|
-        match = match || (child_node && child_node.match?(@rules))
+        match ||= (child_node && child_node.match?(@rules))
       end
       match
     end
diff --git a/lib/synvert/core/rewriter/condition/unless_exist_condition.rb b/lib/synvert/core/rewriter/condition/unless_exist_condition.rb
index c1b4af4d..8627e5ea 100644
--- a/lib/synvert/core/rewriter/condition/unless_exist_condition.rb
+++ b/lib/synvert/core/rewriter/condition/unless_exist_condition.rb
@@ -8,7 +8,7 @@ class Rewriter::UnlessExistCondition < Rewriter::Condition
     def match?
       match = false
       @instance.current_node.recursive_children do |child_node|
-        match = match || (child_node && child_node.match?(@rules))
+        match ||= (child_node && child_node.match?(@rules))
       end
       !match
     end