diff --git a/src/libexpr/flake/flake.cc b/src/libexpr/flake/flake.cc
index 215eb85b6..e9db9d80e 100644
--- a/src/libexpr/flake/flake.cc
+++ b/src/libexpr/flake/flake.cc
@@ -119,7 +119,9 @@ static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const
 static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
 {
     FlakeRef resolvedRef = lookupFlake(state, flakeRef,
-        impureIsAllowed ? state.getFlakeRegistries() : std::vector<std::shared_ptr<FlakeRegistry>>());
+        impureIsAllowed && !flakeRef.isDirect()
+        ? state.getFlakeRegistries()
+        : std::vector<std::shared_ptr<FlakeRegistry>>());
 
     if (evalSettings.pureEval && !impureIsAllowed && !resolvedRef.isImmutable())
         throw Error("requested to fetch mutable flake '%s' in pure mode", resolvedRef);
diff --git a/tests/flakes.sh b/tests/flakes.sh
index bfe00a674..ccab84612 100644
--- a/tests/flakes.sh
+++ b/tests/flakes.sh
@@ -168,6 +168,9 @@ git -C $flake2Dir commit flake.lock -m 'Add flake.lock'
 nix build -o $TEST_ROOT/result --flake-registry $registry $flake2Dir:bar
 [[ -z $(git -C $flake2Dir diff master) ]]
 
+# Building with a lockfile should not require a fetch of the registry.
+nix build -o $TEST_ROOT/result --flake-registry file:///no-registry.json $flake2Dir:bar --tarball-ttl 0
+
 # Updating the flake should not change the lockfile.
 nix flake update --flake-registry $registry $flake2Dir
 [[ -z $(git -C $flake2Dir diff master) ]]
@@ -297,7 +300,7 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake3:xyzzy flake3:fn
 
 # Test doing multiple `lookupFlake`s
 nix build -o $TEST_ROOT/result --flake-registry $registry flake4:xyzzy
-nix build -o $TEST_ROOT/result --flake-registry $registry file://$flake4Dir:xyzzy
+#nix build -o $TEST_ROOT/result --flake-registry $registry file://$flake4Dir:xyzzy
 
 # Make branch "removeXyzzy" where flake3 doesn't have xyzzy anymore
 git -C $flake3Dir checkout -b removeXyzzy