diff --git a/pkgs/applications/window-managers/sway/contrib.nix b/pkgs/applications/window-managers/sway/contrib.nix
index 2f7e20ede229..df5ad07b1c5a 100644
--- a/pkgs/applications/window-managers/sway/contrib.nix
+++ b/pkgs/applications/window-managers/sway/contrib.nix
@@ -73,6 +73,7 @@ grimshot = stdenv.mkDerivation rec {
   meta = with lib; {
     description = "A helper for screenshots within sway";
     maintainers = with maintainers; [ evils ];
+    mainProgram = "grimshot";
   };
 };
 
diff --git a/pkgs/misc/screensavers/vlock/default.nix b/pkgs/misc/screensavers/vlock/default.nix
index 1602c94c0992..c156373f1481 100644
--- a/pkgs/misc/screensavers/vlock/default.nix
+++ b/pkgs/misc/screensavers/vlock/default.nix
@@ -26,5 +26,6 @@ stdenv.mkDerivation rec {
     license = licenses.gpl2;
     maintainers = [ ];
     platforms = platforms.linux;
+    mainProgram = "vlock";
   };
 }
diff --git a/pkgs/tools/archivers/unzip/default.nix b/pkgs/tools/archivers/unzip/default.nix
index b0a4484e87f3..ab37ef98c0bd 100644
--- a/pkgs/tools/archivers/unzip/default.nix
+++ b/pkgs/tools/archivers/unzip/default.nix
@@ -102,5 +102,6 @@ stdenv.mkDerivation rec {
     description = "An extraction utility for archives compressed in .zip format";
     license = lib.licenses.free; # http://www.info-zip.org/license.html
     platforms = lib.platforms.all;
+    mainProgram = "unzip";
   };
 }
diff --git a/pkgs/tools/audio/pulsemixer/default.nix b/pkgs/tools/audio/pulsemixer/default.nix
index e6fc0c03e898..e4204321bc4d 100644
--- a/pkgs/tools/audio/pulsemixer/default.nix
+++ b/pkgs/tools/audio/pulsemixer/default.nix
@@ -31,5 +31,6 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
     maintainers = [ maintainers.woffs ];
     platforms = platforms.all;
+    mainProgram = "pulsemixer";
   };
 }