diff --git a/snix/eval/tests/nix_oracle.rs b/snix/eval/tests/nix_oracle.rs
index 50a9274be..4cf9a1190 100644
--- a/snix/eval/tests/nix_oracle.rs
+++ b/snix/eval/tests/nix_oracle.rs
@@ -175,5 +175,5 @@ compare_lazy_eval_tests! {
     unthunked_formals_fallback_literal("({ foo ? 12 }: [ foo ]) { }");
     unthunked_formals_fallback_string_literal("({ foo ? \"wiggly\" }: [ foo ]) { }");
     thunked_formals_fallback_application("({ foo ? builtins.add 1 2 }: [ foo ]) { }");
-    thunked_formals_fallback_name_resolution_literal("({ foo ? bar, bar ? 12 }: [ foo ]) { }");
+    thunked_formals_fallback_name_resolution_literal("({ foo ? bar, bar ? 12 + 1 }: [ foo ]) { }");
 }
diff --git a/snix/shell.nix b/snix/shell.nix
index e504e459f..5c963eebe 100644
--- a/snix/shell.nix
+++ b/snix/shell.nix
@@ -48,7 +48,6 @@ pkgs.mkShell {
     pkgs.mdbook-admonish
     pkgs.mdbook-d2
     pkgs.mdbook-plantuml
-    pkgs.nix_2_3 # b/313
     pkgs.pkg-config
     pkgs.rust-analyzer
     pkgs.rustc