diff --git a/src/modules/module_20510.c b/src/modules/module_20510.c
index baad333a6..031572e2c 100644
--- a/src/modules/module_20510.c
+++ b/src/modules/module_20510.c
@@ -129,6 +129,13 @@ typedef struct pkzip_extra
 
 } pkzip_extra_t;
 
+u32 module_pw_min (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
+{
+  const u32 pw_min = 6;
+
+  return pw_min;
+}
+
 u64 module_tmp_size (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSED const user_options_t *user_options, MAYBE_UNUSED const user_options_extra_t *user_options_extra)
 {
   const u64 tmp_size = (const u64) sizeof (pkzip_extra_t);
@@ -264,7 +271,7 @@ void module_init (module_ctx_t *module_ctx)
   module_ctx->module_potfile_keep_all_hashes  = MODULE_DEFAULT;
   module_ctx->module_pwdump_column            = MODULE_DEFAULT;
   module_ctx->module_pw_max                   = MODULE_DEFAULT;
-  module_ctx->module_pw_min                   = MODULE_DEFAULT;
+  module_ctx->module_pw_min                   = module_pw_min;
   module_ctx->module_salt_max                 = MODULE_DEFAULT;
   module_ctx->module_salt_min                 = MODULE_DEFAULT;
   module_ctx->module_salt_type                = module_salt_type;
diff --git a/tools/test_modules/m20510.pm b/tools/test_modules/m20510.pm
index 2af8ca390..2bc56612e 100644
--- a/tools/test_modules/m20510.pm
+++ b/tools/test_modules/m20510.pm
@@ -8,7 +8,7 @@
 use strict;
 use warnings;
 
-sub module_constraints { [[0, 250], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
+sub module_constraints { [[6, 250], [-1, -1], [-1, -1], [-1, -1], [-1, -1]] }
 
 my @crc32tab =
 (