diff --git a/webapp_calendar.py b/webapp_calendar.py
index 368cd83fa..705058672 100644
--- a/webapp_calendar.py
+++ b/webapp_calendar.py
@@ -194,7 +194,7 @@ def _html_calendar_day(person_cache: {}, css_cache: {}, translate: {},
                                 html_open_street_map(event_place,
                                                      bounding_box_degrees,
                                                      translate,
-                                                     '30vw', '30vw')
+                                                     '320', '320')
                             if event_map:
                                 event_place = event_map