1 files changed, 4 insertions, 2 deletions
diff --git a/src/libstore/tests/outputs-spec.cc b/src/libstore/tests/outputs-spec.cc
index 984d1d963..bf8deaa9d 100644
--- a/src/libstore/tests/outputs-spec.cc
+++ b/src/libstore/tests/outputs-spec.cc
@@ -206,15 +206,17 @@ using namespace nix;
 
 Gen<OutputsSpec> Arbitrary<OutputsSpec>::arbitrary()
 {
-    switch (*gen::inRange<uint8_t>(0, 1)) {
+    switch (*gen::inRange<uint8_t>(0, std::variant_size_v<OutputsSpec::Raw>)) {
     case 0:
         return gen::just((OutputsSpec) OutputsSpec::All { });
-    default:
+    case 1:
         return gen::just((OutputsSpec) OutputsSpec::Names {
             *gen::nonEmpty(gen::container<StringSet>(gen::map(
                 gen::arbitrary<StorePathName>(),
                 [](StorePathName n) { return n.name; }))),
         });
+    default:
+        assert(false);
     }
 }