diff --git a/lib/asciidoctor/java/AsciiDoctor.java b/lib/asciidoctor/java/AsciiDoctor.java
index 667f274a28..8e18feb137 100644
--- a/lib/asciidoctor/java/AsciiDoctor.java
+++ b/lib/asciidoctor/java/AsciiDoctor.java
@@ -151,6 +151,7 @@ public class AsciiDoctor {
       }
 
       File[] cssFiles = tmpdir.listFiles(new FilenameFilter() {
+        @Override
         public boolean accept(File dir, String name) {
           return name.endsWith(".css");
         }