diff --git a/lib/signature-help-manager.js b/lib/signature-help-manager.js
index 338aa75..c1a5114 100644
--- a/lib/signature-help-manager.js
+++ b/lib/signature-help-manager.js
@@ -305,7 +305,7 @@ module.exports = class SignatureHelpManager {
 
     const marker = editor.decorateMarker(overlayMarker, {
       type: 'overlay',
-      class: 'datatip-overlay',
+      class: 'signature-overlay',
       position: 'head',
       item: view.element,
     });