diff --git a/ql/src/printAst.ql b/ql/src/printAst.ql
index adc1dd1fb48..e5b36e73fe3 100644
--- a/ql/src/printAst.ql
+++ b/ql/src/printAst.ql
@@ -20,7 +20,9 @@ external string selectedSourceFile();
  * Hook to customize the functions printed by this query.
  */
 class Cfg extends PrintAstConfiguration {
-  override predicate shouldPrintFunction(FuncDef func) {
-    func.getFile() = getEncodedFile(selectedSourceFile())
-  }
+  override predicate shouldPrintFunction(FuncDef func) { shouldPrintFile(func.getFile()) }
+
+  override predicate shouldPrintFile(File file) { file = getEncodedFile(selectedSourceFile()) }
+
+  override predicate shouldPrintComments(File file) { none() }
 }