diff --git a/lib/common/utils.mjs b/lib/common/utils.mjs
index b78c9b0..9ee8a90 100644
--- a/lib/common/utils.mjs
+++ b/lib/common/utils.mjs
@@ -240,6 +240,7 @@ function normalizeReference (str) {
   // (remove this when node v10 is no longer supported).
   //
   if ('ẞ'.toLowerCase() === 'Ṿ') {
+    /* c8 ignore next 2 */
     str = str.replace(/ẞ/g, 'ß')
   }