diff --git a/pkgs/applications/misc/batsignal/default.nix b/pkgs/applications/misc/batsignal/default.nix
index 1618bf746ce0..abf3f53e32a8 100644
--- a/pkgs/applications/misc/batsignal/default.nix
+++ b/pkgs/applications/misc/batsignal/default.nix
@@ -21,5 +21,6 @@ stdenv.mkDerivation rec {
     license = licenses.isc;
     maintainers = with maintainers; [ SlothOfAnarchy ];
     platforms = platforms.linux;
+    mainProgram = "batsignal";
   };
 }
diff --git a/pkgs/applications/misc/safeeyes/default.nix b/pkgs/applications/misc/safeeyes/default.nix
index 387f54e21544..f5cd73e03137 100644
--- a/pkgs/applications/misc/safeeyes/default.nix
+++ b/pkgs/applications/misc/safeeyes/default.nix
@@ -67,5 +67,6 @@ buildPythonApplication rec {
     license = licenses.gpl3;
     maintainers = with maintainers; [ srghma ];
     platforms = platforms.linux;
+    mainProgram = "safeeyes";
   };
 }
diff --git a/pkgs/development/tools/pyenv/default.nix b/pkgs/development/tools/pyenv/default.nix
index bdc338bcfac5..da10a9ba8f24 100644
--- a/pkgs/development/tools/pyenv/default.nix
+++ b/pkgs/development/tools/pyenv/default.nix
@@ -50,5 +50,6 @@ stdenv.mkDerivation rec {
     license = licenses.mit;
     maintainers = with maintainers; [ tjni ];
     platforms = platforms.all;
+    mainProgram = "pyenv";
   };
 }
diff --git a/pkgs/tools/misc/rtx/default.nix b/pkgs/tools/misc/rtx/default.nix
index f4bda68fdaa0..fce442da8a7a 100644
--- a/pkgs/tools/misc/rtx/default.nix
+++ b/pkgs/tools/misc/rtx/default.nix
@@ -64,5 +64,6 @@ rustPlatform.buildRustPackage rec {
     changelog = "https://github.com/jdxcode/rtx/releases/tag/v${version}";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [ konradmalik ];
+    mainProgram = "rtx";
   };
 }
diff --git a/pkgs/tools/networking/goimapnotify/default.nix b/pkgs/tools/networking/goimapnotify/default.nix
index 5df6013855a3..e7f7faac5cf4 100644
--- a/pkgs/tools/networking/goimapnotify/default.nix
+++ b/pkgs/tools/networking/goimapnotify/default.nix
@@ -25,5 +25,6 @@ buildGoModule rec {
     homepage = "https://gitlab.com/shackra/goimapnotify";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ wohanley ];
+    mainProgram = "goimapnotify";
   };
 }