diff --git a/tests/modules/programs/htop/empty-settings.nix b/tests/modules/programs/htop/empty-settings.nix
index 8454e9a5b..ae4e437fd 100644
--- a/tests/modules/programs/htop/empty-settings.nix
+++ b/tests/modules/programs/htop/empty-settings.nix
@@ -6,6 +6,9 @@ with lib;
   config = {
     programs.htop.enable = true;
 
+    nixpkgs.overlays =
+      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
+
     nmt.script = ''
       assertPathNotExists home-files/.config/htop
     '';
diff --git a/tests/modules/programs/htop/example-settings.nix b/tests/modules/programs/htop/example-settings.nix
index 8705e4b48..412b8c7d8 100644
--- a/tests/modules/programs/htop/example-settings.nix
+++ b/tests/modules/programs/htop/example-settings.nix
@@ -36,6 +36,9 @@ with lib;
           (text "Systemd")
         ]);
 
+    nixpkgs.overlays =
+      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
+
     nmt.script = ''
       htoprc=home-files/.config/htop/htoprc
       assertFileExists $htoprc
diff --git a/tests/modules/programs/htop/settings-without-fields.nix b/tests/modules/programs/htop/settings-without-fields.nix
index 19d3e81f1..7a6ebe8dc 100644
--- a/tests/modules/programs/htop/settings-without-fields.nix
+++ b/tests/modules/programs/htop/settings-without-fields.nix
@@ -7,6 +7,9 @@ with lib;
     programs.htop.enable = true;
     programs.htop.settings = { color_scheme = 6; };
 
+    nixpkgs.overlays =
+      [ (self: super: { htop = pkgs.writeScriptBin "dummy" ""; }) ];
+
     # Test that the 'fields' key is written in addition to the customized
     # settings or htop won't read the options.
     nmt.script = ''