diff --git a/Logic/Osm/OsmPreferences.ts b/Logic/Osm/OsmPreferences.ts
index bff50eae60..cd688b89c7 100644
--- a/Logic/Osm/OsmPreferences.ts
+++ b/Logic/Osm/OsmPreferences.ts
@@ -97,7 +97,7 @@ export class OsmPreferences {
 
     public GetPreference(key: string, prefix: string = "mapcomplete-"): UIEventSource<string> {
         key = prefix + key;
-        key = key.replace(/[:\\\/"' {}.%]/g, '')
+        key = key.replace(/[:\\\/"' {}.%_]/g, '')
         if (key.length >= 255) {
             throw "Preferences: key length to big";
         }