diff --git a/docs/howto-develop.rst b/docs/howto-develop.rst
index 83e2168..57afee3 100644
--- a/docs/howto-develop.rst
+++ b/docs/howto-develop.rst
@@ -13,8 +13,8 @@ You can run the testsuite via
 
 ::
 
-   $ nix-build tests -A extern.nixpkgs_20_03
-   $ nix-build tests -A intern.nixpkgs_unstable
+   $ nix-build tests -A external.nixpkgs_20_03
+   $ nix-build tests -A internal.nixpkgs_unstable
    ...
 
 Contributing to the documentation
diff --git a/tests/default.nix b/tests/default.nix
index 6ebea89..10aba18 100644
--- a/tests/default.nix
+++ b/tests/default.nix
@@ -1,9 +1,9 @@
 # Generate an attribute sets containing all tests for all releaeses
 # It looks like:
-# - extern.nixpkgs_20.03
-# - extern.nixpkgs_unstable
-# - intern.nixpkgs_20.03
-# - intern.nixpkgs_unstable
+# - external.nixpkgs_20.03
+# - external.nixpkgs_unstable
+# - internal.nixpkgs_20.03
+# - internal.nixpkgs_unstable
 
 with builtins;
 
@@ -32,8 +32,8 @@ let
   ];
 
   testNames = [
-    "intern"
-    "extern"
+    "internal"
+    "external"
     "clamav"
     "multiple"
   ];
diff --git a/tests/extern.nix b/tests/external.nix
similarity index 99%
rename from tests/extern.nix
rename to tests/external.nix
index 9c7d5c1..f453608 100644
--- a/tests/extern.nix
+++ b/tests/external.nix
@@ -17,7 +17,7 @@
 { pkgs ? import <nixpkgs> {}}:
 
 pkgs.nixosTest {
-  name = "extern";
+  name = "external";
   nodes = {
     server = { config, pkgs, ... }:
         {
diff --git a/tests/intern.nix b/tests/internal.nix
similarity index 99%
rename from tests/intern.nix
rename to tests/internal.nix
index b357ed9..12590c0 100644
--- a/tests/intern.nix
+++ b/tests/internal.nix
@@ -37,7 +37,7 @@ let
   passwordFile = pkgs.writeText "password" "my-password";
 in
 pkgs.nixosTest {
-  name = "intern";
+  name = "internal";
   nodes = {
     machine = { config, pkgs, ... }: {
       imports = [