diff --git a/tools/test_modules/m15000.pm b/tools/test_modules/m15000.pm
index 6ee5a7c27..7c92039c1 100644
--- a/tools/test_modules/m15000.pm
+++ b/tools/test_modules/m15000.pm
@@ -10,7 +10,7 @@ use warnings;
 
 use Digest::SHA qw (sha512_hex);
 
-sub module_constraints { [[0, 256], [64, 64], [0, 55], [64, 64], [-1, -1]] }
+sub module_constraints { [[0, 256], [64, 64], [0, 47], [64, 64], [0, 55]] }
 
 sub module_generate_hash
 {