diff --git a/.dev-tools/generate-regex-format-referrers.php b/.dev-tools/generate-regex-format-referrers.php
index 66638397d..add5dda5b 100755
--- a/.dev-tools/generate-regex-format-referrers.php
+++ b/.dev-tools/generate-regex-format-referrers.php
@@ -84,7 +84,7 @@ class Generator
         $data = "";
     {
         foreach ($lines as $line) {
-            $data .= "\"~*\b" . preg_quote($line) . "\"\b" "\t1;\n";
+            $data .= "\"~*\\b" . preg_quote($line) . "\"\\b" "\t1;\n";
         }
         $this->writeToFile($file, $data);
     	}