diff --git a/src/rules.ts b/src/rules.ts
index 4983a8ab48..e90f3e25d0 100644
--- a/src/rules.ts
+++ b/src/rules.ts
@@ -16,10 +16,10 @@ function edit(regex: string | RegExp, opt = '') {
   return obj;
 }
 
-const supportsLookbehind = (() => {
+// use a default variable to ensure the regex is evaluated on client an not removed by minifiers
+const supportsLookbehind = ((a = '') => {
 try {
-  // eslint-disable-next-line prefer-regex-literals
-  return !!new RegExp('(?<=1)(?<!1)');
+  return !!new RegExp('(?<=1)(?<!1)' + a);
 } catch {
   // See browser support here:
   // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Regular_expressions/Lookbehind_assertion