diff --git a/tools/test_modules/m00400.pm b/tools/test_modules/m00400.pm
index c6073edd5..3e95c9eed 100644
--- a/tools/test_modules/m00400.pm
+++ b/tools/test_modules/m00400.pm
@@ -12,7 +12,7 @@ use warnings;
 
 use Authen::Passphrase::PHPass;
 
-sub module_constraints { [[0, 256], [8, 8], [0, 55], [8, 8], [-1, -1]] }
+sub module_constraints { [[0, 256], [8, 8], [0, 39], [8, 8], [-1, -1]] }
 
 sub module_generate_hash
 {