diff --git a/src/tools/tidy/src/features.rs b/src/tools/tidy/src/features.rs
index 24c98b54a98f4..b14b5aeb57236 100644
--- a/src/tools/tidy/src/features.rs
+++ b/src/tools/tidy/src/features.rs
@@ -425,7 +425,7 @@ fn map_lib_features(
                 }
 
                 lazy_static::lazy_static! {
-                    static ref COMMENT_LINE: Regex = Regex::new(r"\s*//").unwrap();
+                    static ref COMMENT_LINE: Regex = Regex::new(r"^\s*//").unwrap();
                 }
                 // exclude commented out lines
                 if COMMENT_LINE.is_match(line) {