diff --git a/transliteration.admin.inc b/transliteration.admin.inc
index 3023d0b49816f0d1ceb521551ee014368b9c49bd..accf848b112c1a5ac2720c0840bcdde0d3ea22d9 100644
--- a/transliteration.admin.inc
+++ b/transliteration.admin.inc
@@ -137,7 +137,7 @@ function transliteration_file_query() {
   switch (db_driver()) {
     case 'mysql':
     case 'mysqli':
-      $operator = 'NOT REGEXP';
+      $operator = 'NOT REGEXP BINARY';
       $regex = '/[a-z0-9_.-]+$';
       break;