diff --git a/spec/ameba/rule/style/redundant_parentheses_spec.cr b/spec/ameba/rule/style/redundant_parentheses_spec.cr
index c356b63d..92aa9cea 100644
--- a/spec/ameba/rule/style/redundant_parentheses_spec.cr
+++ b/spec/ameba/rule/style/redundant_parentheses_spec.cr
@@ -84,6 +84,12 @@ module Ameba::Rule::Style
             end
             CRYSTAL
 
+          expect_no_issues subject, <<-CRYSTAL
+            if !(foo = @foo)
+              foo
+            end
+            CRYSTAL
+
           expect_no_issues subject, <<-CRYSTAL
             if foo = @foo
               foo