diff --git a/sbt-bridge/src/xsbt/DottydocRunner.java b/sbt-bridge/src/xsbt/DottydocRunner.java
index 48883ab13e3c..31a9cc97a43b 100644
--- a/sbt-bridge/src/xsbt/DottydocRunner.java
+++ b/sbt-bridge/src/xsbt/DottydocRunner.java
@@ -67,7 +67,7 @@ public void run() {
         }
         return msg.toString();
       });
-      args = retained.toArray(args0);
+      args = retained.toArray(new String[retained.size()]);
     } else {
       args = args0;
     }