diff --git a/tools/build/checkstyle9.pl b/tools/build/checkstyle9.pl
index 3b28fef93669..8b30baa10fc9 100755
--- a/tools/build/checkstyle9.pl
+++ b/tools/build/checkstyle9.pl
@@ -2546,7 +2546,7 @@ sub process {
 					$herectx .= raw_line($linenr, $n) . "\n";;
 				}
 
-				ERROR("braces {} are necessary even for single statement blocks\n" . $herectx);
+				WARN("braces {} are encouraged even for single statement blocks\n" . $herectx);
 			}
 		}