diff --git a/pkgs/clan-cli/clan_cli/flash/list_test.py b/pkgs/clan-cli/clan_cli/flash/list_test.py
index e41a88c01..a21a14709 100644
--- a/pkgs/clan-cli/clan_cli/flash/list_test.py
+++ b/pkgs/clan-cli/clan_cli/flash/list_test.py
@@ -1,11 +1,15 @@
+from pathlib import Path
+
 import pytest
 
 from clan_cli.tests.helpers import cli
 from clan_cli.tests.stdout import CaptureOutput
 
 
-@pytest.mark.impure
-def test_flash_list_languages(capture_output: CaptureOutput) -> None:
+@pytest.mark.with_core
+def test_flash_list_languages(
+    temporary_home: Path, capture_output: CaptureOutput
+) -> None:
     with capture_output as output:
         cli.run(["flash", "list", "languages"])
     assert "en_US.UTF-8" in output.out
@@ -14,8 +18,10 @@ def test_flash_list_languages(capture_output: CaptureOutput) -> None:
     assert len(languages) > 1
 
 
-@pytest.mark.impure
-def test_flash_list_keymaps(capture_output: CaptureOutput) -> None:
+@pytest.mark.with_core
+def test_flash_list_keymaps(
+    temporary_home: Path, capture_output: CaptureOutput
+) -> None:
     with capture_output as output:
         cli.run(["flash", "list", "keymaps"])
     assert "us" in output.out
diff --git a/pkgs/clan-cli/clan_lib/flash/list.py b/pkgs/clan-cli/clan_lib/flash/list.py
index 4a23c8476..5d2fdaf86 100644
--- a/pkgs/clan-cli/clan_lib/flash/list.py
+++ b/pkgs/clan-cli/clan_lib/flash/list.py
@@ -5,6 +5,7 @@ from typing import TypedDict
 
 from clan_lib.api import API
 from clan_lib.cmd import Log, RunOpts, run
+from clan_lib.dirs import nixpkgs_source
 from clan_lib.errors import ClanError
 from clan_lib.nix import nix_build
 
@@ -28,7 +29,7 @@ def get_machine_flash_options() -> FlashOptions:
 
 
 def list_languages() -> list[str]:
-    cmd = nix_build(["nixpkgs#glibcLocales"])
+    cmd = nix_build([f"{nixpkgs_source()}#legacyPackages.x86_64-linux.glibcLocales"])
     result = run(cmd, RunOpts(log=Log.STDERR, error_msg="Failed to find glibc locales"))
     locale_file = Path(result.stdout.strip()) / "share" / "i18n" / "SUPPORTED"
 
@@ -53,7 +54,7 @@ def list_languages() -> list[str]:
 
 
 def list_keymaps() -> list[str]:
-    cmd = nix_build(["nixpkgs#kbd"])
+    cmd = nix_build([f"{nixpkgs_source()}#legacyPackages.x86_64-linux.kbd"])
     result = run(cmd, RunOpts(log=Log.STDERR, error_msg="Failed to find kbdinfo"))
     keymaps_dir = Path(result.stdout.strip()) / "share" / "keymaps"
 
diff --git a/pkgs/clan-cli/default.nix b/pkgs/clan-cli/default.nix
index f98dded0f..1ca80d6df 100644
--- a/pkgs/clan-cli/default.nix
+++ b/pkgs/clan-cli/default.nix
@@ -216,6 +216,10 @@ pythonRuntime.pkgs.buildPythonApplication {
               pkgs.xkcdpass
               pkgs.pass
               nix-select
+
+              # needed by flash list tests
+              nixpkgs.legacyPackages.x86_64-linux.kbd
+              nixpkgs.legacyPackages.x86_64-linux.glibcLocales
             ];
           };
         }