diff --git a/go/ql/lib/semmle/go/PrintAst.qll b/go/ql/lib/semmle/go/PrintAst.qll
index 6ea5fcc3971..c7c9bb5b4b7 100644
--- a/go/ql/lib/semmle/go/PrintAst.qll
+++ b/go/ql/lib/semmle/go/PrintAst.qll
@@ -1,7 +1,7 @@
 /**
  * Provides queries to pretty-print a Go AST as a graph.
  */
-overlay[local]
+overlay[local?]
 module;
 
 import go