diff --git a/src/pretix/presale/views/widget.py b/src/pretix/presale/views/widget.py
index 3a167a94b9..0008dfe918 100644
--- a/src/pretix/presale/views/widget.py
+++ b/src/pretix/presale/views/widget.py
@@ -115,7 +115,7 @@ def generate_widget_js(lang):
         ]
         for fname in files:
             f = finders.find(fname)
-            with open(f, 'r') as fp:
+            with open(f, 'r', encoding='utf-8') as fp:
                 code.append(fp.read())
 
         if settings.DEBUG: