diff --git a/types/ace/index.d.ts b/types/ace/index.d.ts
index 7faa5da4f8..cd20b57f05 100644
--- a/types/ace/index.d.ts
+++ b/types/ace/index.d.ts
@@ -1223,7 +1223,7 @@ declare namespace AceAjax {
         /**
          * Returns `true` if the current `textInput` is in focus.
         **/
-        isFocused(): void;
+        isFocused(): boolean;
 
         /**
          * Blurs the current `textInput`.