diff --git a/tools/test_modules/m06800.pm b/tools/test_modules/m06800.pm
index 283ac11e7..5e8a4a990 100644
--- a/tools/test_modules/m06800.pm
+++ b/tools/test_modules/m06800.pm
@@ -11,7 +11,8 @@ use warnings;
 use Crypt::CBC;
 use Crypt::PBKDF2;
 
-sub module_constraints { [[0, 255], [1, 15], [-1, -1], [-1, -1], [-1, -1]] }
+# we need to make sure the salts are unique, otherwise this module will fail
+sub module_constraints { [[0, 255], [10, 15], [-1, -1], [-1, -1], [-1, -1]] }
 
 sub module_generate_hash
 {