diff --git a/pkgs/applications/audio/ponymix/default.nix b/pkgs/applications/audio/ponymix/default.nix
index 70e7217dff79..e0cf106e460b 100644
--- a/pkgs/applications/audio/ponymix/default.nix
+++ b/pkgs/applications/audio/ponymix/default.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "CLI PulseAudio Volume Control";
     homepage = "https://github.com/falconindy/ponymix";
+    mainProgram = "ponymix";
     license = licenses.mit;
     platforms = platforms.linux;
     maintainers = with maintainers; [ ericsagnes ];
diff --git a/pkgs/applications/window-managers/sway/lock.nix b/pkgs/applications/window-managers/sway/lock.nix
index 20a7a5ed7fe0..0b438df13d28 100644
--- a/pkgs/applications/window-managers/sway/lock.nix
+++ b/pkgs/applications/window-managers/sway/lock.nix
@@ -31,6 +31,7 @@ stdenv.mkDerivation rec {
       you need to set "security.pam.services.swaylock = {};" manually.
     '';
     inherit (src.meta) homepage;
+    mainProgram = "swaylock";
     license = licenses.mit;
     platforms = platforms.linux;
     maintainers = with maintainers; [ primeos ];
diff --git a/pkgs/os-specific/linux/brillo/default.nix b/pkgs/os-specific/linux/brillo/default.nix
index 4446ed005028..237b6db65b02 100644
--- a/pkgs/os-specific/linux/brillo/default.nix
+++ b/pkgs/os-specific/linux/brillo/default.nix
@@ -27,6 +27,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "Backlight and Keyboard LED control tool";
     homepage = "https://gitlab.com/cameronnemo/brillo";
+    mainProgram = "brillo";
     license = [ licenses.gpl3 licenses.bsd0 ];
     platforms = platforms.linux;
     maintainers = [ maintainers.alexarice ];