diff --git a/apps/api/wopi/editor-wopi.ejs b/apps/api/wopi/editor-wopi.ejs
index f62d63706..d7301abad 100644
--- a/apps/api/wopi/editor-wopi.ejs
+++ b/apps/api/wopi/editor-wopi.ejs
@@ -286,7 +286,7 @@ div {
                             "www": fileInfo.BreadcrumbBrandUrl
                         },
                         "chat": queryParams.dchat!=="1",
-                        "uiTheme": queryParams.thm==="1" ? "theme-light" : (queryParams.thm==="2" ? "theme-dark" : undefined)
+                        "uiTheme": queryParams.thm==="1" ? "default-light" : (queryParams.thm==="2" ? "default-dark" : undefined)
 					},
                     "coEditing": {
                         "mode": "fast",