diff --git a/tests/lang/eval-okay-context.nix b/tests/lang/eval-okay-context.nix
index 8cd8f2e13..7b9531cfe 100644
--- a/tests/lang/eval-okay-context.nix
+++ b/tests/lang/eval-okay-context.nix
@@ -1,4 +1,4 @@
-let s = "foo ${builtins.substring 33 100 (baseNameOf ./eval-okay-context.nix)} bar";
+let s = "foo ${builtins.substring 33 100 (baseNameOf "${./eval-okay-context.nix}")} bar";
 in
   if s != "foo eval-okay-context.nix bar"
   then abort "context not discarded"