diff --git a/octoprint_firmwareupdater/static/js/firmwareupdater.js b/octoprint_firmwareupdater/static/js/firmwareupdater.js
index a201dd2..2af62d0 100644
--- a/octoprint_firmwareupdater/static/js/firmwareupdater.js
+++ b/octoprint_firmwareupdater/static/js/firmwareupdater.js
@@ -643,7 +643,7 @@ $(function() {
             }
 
             if (self.getProfileSetting("flash_method") == "marlinbft" && self.getProfileSetting("marlinbft_use_custom_filename") && !self.checkMarlinBftCustomFileName()) {
-                alert = gettext("The target filename is invalid. Filename must be 8dot3 format.");
+                alert = gettext("The target filename is invalid.");
             }
 
             if (!self.flashPort() &! self.getProfileSetting("flash_method") == "dfuprogrammer") {
@@ -1326,7 +1326,7 @@ $(function() {
 
         self.checkMarlinBftCustomFileName = function() {
             var filename = self.getProfileSetting("marlinbft_custom_filename")
-            var filenamePattern = new RegExp("^[A-z0-9_-]{1,8}\\.[A-z0-9]{1,3}$");
+            var filenamePattern = new RegExp("^[A-z0-9_-]{1,}\\.[A-z0-9]{1,3}$");
             return filenamePattern.test(filename);
         }
 
diff --git a/octoprint_firmwareupdater/templates/firmwareupdater_settings.jinja2 b/octoprint_firmwareupdater/templates/firmwareupdater_settings.jinja2
index 9062308..0a899c2 100644
--- a/octoprint_firmwareupdater/templates/firmwareupdater_settings.jinja2
+++ b/octoprint_firmwareupdater/templates/firmwareupdater_settings.jinja2
@@ -547,7 +547,7 @@
                                         <input type="text" class="input-block-level" data-bind='value: configMarlinBftCustomFilename, enable: configMarlinBftUseCustomFilename, valueUpdate: "afterkeydown"'>
                                         <button class="btn" type="button" data-bind="click: resetMarlinBftCustomFilename, enable: configMarlinBftUseCustomFilename">{{ _('Reset') }}</button>
                                     </div>
-                                    <span class="help-block">{{ _('Firmware file will be saved on the printer using the specified name. Filename must be in <a href=https://en.wikipedia.org/wiki/8.3_filename>8dot3 format</a> (up 8 character name, up to 3 character extension).') }}</span>
+                                    <span class="help-block">{{ _('Firmware file will be saved on the printer using the specified name.') }}</span>
                                 </div>
                             </div>
                         </div>