diff --git a/inc/themes/material-blue/install.inc b/inc/themes/material-blue/install.inc
index d76604af..c0ef2a72 100644
--- a/inc/themes/material-blue/install.inc
+++ b/inc/themes/material-blue/install.inc
@@ -108,7 +108,7 @@
 
                 <div class="mdl-textfield mdl-js-textfield mdl-textfield--floating-label">
                     <input id="dbhost" name="dbhost" type="text" required class="mdl-textfield__input fg-blue100"
-                           value="<?php echo $dbhost; ?>" autocomplete="off" autofocus pattern="[0-9a-zA-Z_-\.]+">
+                           value="<?php echo $dbhost; ?>" autocomplete="off" autofocus pattern="[0-9a-zA-Z_\-\.]+">
                     <label class="mdl-textfield__label"
                            for="dbhost"><?php echo _('Servidor BBDD para sysPass'); ?></label>
                 </div>
@@ -150,4 +150,4 @@
             $('#frmInstall').submit();
         });
     };
-</script>
\ No newline at end of file
+</script>