diff --git a/pkgs/os-specific/linux/zfs/default.nix b/pkgs/os-specific/linux/zfs/default.nix
index 85ed3888c1ea..c9f0438c86f5 100644
--- a/pkgs/os-specific/linux/zfs/default.nix
+++ b/pkgs/os-specific/linux/zfs/default.nix
@@ -196,6 +196,7 @@ let
         license = licenses.cddl;
         platforms = platforms.linux;
         maintainers = with maintainers; [ hmenke jcumming jonringer wizeman fpletz globin mic92 ];
+        mainProgram = "zfs";
         # If your Linux kernel version is not yet supported by zfs, try zfsUnstable.
         # On NixOS set the option boot.zfs.enableUnstable.
         broken = buildKernel && (kernelCompatible != null) && !kernelCompatible;
diff --git a/pkgs/tools/networking/openssh/common.nix b/pkgs/tools/networking/openssh/common.nix
index 40011a14c893..eaa42039dbaa 100644
--- a/pkgs/tools/networking/openssh/common.nix
+++ b/pkgs/tools/networking/openssh/common.nix
@@ -123,5 +123,6 @@ stdenv.mkDerivation rec {
     license = licenses.bsd2;
     platforms = platforms.unix ++ platforms.windows;
     maintainers = with maintainers; [ eelco aneeshusa ];
+    mainProgram = "ssh";
   } // extraMeta;
 }
diff --git a/pkgs/tools/text/gnugrep/default.nix b/pkgs/tools/text/gnugrep/default.nix
index 42a9d913dd20..c5a661af1153 100644
--- a/pkgs/tools/text/gnugrep/default.nix
+++ b/pkgs/tools/text/gnugrep/default.nix
@@ -60,6 +60,7 @@ stdenv.mkDerivation {
 
     maintainers = [ maintainers.eelco ];
     platforms = platforms.all;
+    mainProgram = "grep";
   };
 
   passthru = {inherit pcre;};