diff --git a/conf/.env.production b/conf/.env.production
index ca30422..1a651be 100644
--- a/conf/.env.production
+++ b/conf/.env.production
@@ -30,7 +30,7 @@ UI_URL=__DOMAIN__
 
 # Workouts
 TILE_SERVER_URL=https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png
-MAP_ATTRIBUTION=&copy; <a href="http://www.openstreetmap.org/copyright" target="_blank" rel="noopener noreferrer">OpenStreetMap</a> contributors
+MAP_ATTRIBUTION='&copy; <a href="http://www.openstreetmap.org/copyright" target="_blank" rel="noopener noreferrer">OpenStreetMap</a> contributors'
 DEFAULT_STATICMAP=False
 STATICMAP_SUBDOMAINS=''