diff --git a/jdav_web/members/admin.py b/jdav_web/members/admin.py
index 83f9517..308211a 100644
--- a/jdav_web/members/admin.py
+++ b/jdav_web/members/admin.py
@@ -1082,7 +1082,7 @@ class FreizeitAdmin(CommonAdminMixin, nested_admin.NestedModelAdmin):
                                        'members/V32-1_Themenorientierte_Bildungsmassnahmen.pdf',
                                        context,
                                        save_only=True)
-                return merge_pdfs(title + 'LJP_Antrag', [v32_fp, fp])
+                return merge_pdfs(title + '_LJP_Antrag', [v32_fp, fp])
             return serve_pdf(fp)
         return self.render_seminar_report_options(request, memberlist, GenerateSeminarReportForm())
     seminar_report.short_description = _('Generate seminar report')
diff --git a/jdav_web/members/pdf.py b/jdav_web/members/pdf.py
index 00a9877..05b2c2e 100644
--- a/jdav_web/members/pdf.py
+++ b/jdav_web/members/pdf.py
@@ -128,6 +128,8 @@ def merge_pdfs(name, filenames, save_only=False):
         merger.append(media_path(pdf))
 
     filename = name + "_" + datetime.today().strftime("%d_%m_%Y")
+    filename = filename.replace(' ', '_').replace('&', '').replace('/', '_')
+    filename = unicodedata.normalize('NFKD', filename).encode('ASCII', 'ignore').decode()
     filename_pdf = filename + ".pdf"
     merger.write(media_path(filename_pdf))
     merger.close()