diff --git a/src/modules/module_29100.c b/src/modules/module_29100.c
index 8aa1f2a59..5d2227f41 100644
--- a/src/modules/module_29100.c
+++ b/src/modules/module_29100.c
@@ -62,7 +62,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
 
   token.sep[0]     = '.';
   token.len_min[0] =  0;
-  token.len_max[0] = 2047;
+  token.len_max[0] = 56;
   token.attr[0]    = TOKEN_ATTR_VERIFY_LENGTH
                    | TOKEN_ATTR_VERIFY_BASE64C;