diff --git a/tests/functional/structured-attrs-shell.nix b/tests/functional/structured-attrs-shell.nix
index a819e39cd..e9b9f1e39 100644
--- a/tests/functional/structured-attrs-shell.nix
+++ b/tests/functional/structured-attrs-shell.nix
@@ -21,7 +21,7 @@ mkDerivation {
     "b"
     "c"
   ];
-  exportReferencesGraph.refs = [ dep ];
+  exportReferencesGraph.refs = dep;
   buildCommand = ''
     touch ''${outputs[out]}; touch ''${outputs[dev]}
   '';