diff --git a/pkgs/development/python-modules/liquidctl/default.nix b/pkgs/development/python-modules/liquidctl/default.nix
index bc4dcaee1a19..f6e5379fb271 100644
--- a/pkgs/development/python-modules/liquidctl/default.nix
+++ b/pkgs/development/python-modules/liquidctl/default.nix
@@ -87,5 +87,6 @@ buildPythonPackage rec {
     changelog = "https://github.com/liquidctl/liquidctl/blob/v${version}/CHANGELOG.md";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ arturcygan evils ];
+    mainProgram = "liquidctl";
   };
 }
diff --git a/pkgs/tools/X11/xsecurelock/default.nix b/pkgs/tools/X11/xsecurelock/default.nix
index ab8bbf67ca66..25cd8cc24ced 100644
--- a/pkgs/tools/X11/xsecurelock/default.nix
+++ b/pkgs/tools/X11/xsecurelock/default.nix
@@ -43,5 +43,6 @@ stdenv.mkDerivation rec {
     license = licenses.asl20;
     maintainers = with maintainers; [ fpletz ];
     platforms = platforms.unix;
+    mainProgram = "xsecurelock";
   };
 }
diff --git a/pkgs/tools/system/tree/default.nix b/pkgs/tools/system/tree/default.nix
index 108edfb06308..cb52cbdccb38 100644
--- a/pkgs/tools/system/tree/default.nix
+++ b/pkgs/tools/system/tree/default.nix
@@ -47,5 +47,6 @@ stdenv.mkDerivation rec {
     '';
     platforms = platforms.all;
     maintainers = with maintainers; [ nickcao ];
+    mainProgram = "tree";
   };
 }