diff --git a/app/portainer/views/init/admin/initAdmin.html b/app/portainer/views/init/admin/initAdmin.html
index ef1e669a3..aad4b127d 100644
--- a/app/portainer/views/init/admin/initAdmin.html
+++ b/app/portainer/views/init/admin/initAdmin.html
@@ -167,7 +167,15 @@
             <!-- select-file-input -->
             <div class="form-group">
               <div class="col-sm-12">
-                <button class="btn btn-sm btn-primary" ngf-select accept=".tar.gz,.encrypted" ng-model="formValues.BackupFile" auto-focus>Select file</button>
+                <button
+                    class="btn btn-sm btn-primary"
+                    ngf-select
+                    accept=".gz,.encrypted"
+                    ngf-accept="'application/x-tar,application/x-gzip'"
+                    ng-model="formValues.BackupFile"
+                    auto-focus
+                    >Select file</button
+                  >
                 <span style="margin-left: 5px;">
                   {{ formValues.BackupFile.name }}
                   <i class="fa fa-times red-icon" ng-if="!formValues.BackupFile" aria-hidden="true"></i>