diff --git a/pkgs/stdenv/generic/check-meta.nix b/pkgs/stdenv/generic/check-meta.nix
index 7fa7f2305e84a..ac62ad30829a9 100644
--- a/pkgs/stdenv/generic/check-meta.nix
+++ b/pkgs/stdenv/generic/check-meta.nix
@@ -203,6 +203,7 @@ let
   metaTypes = with lib.types; rec {
     # These keys are documented
     description = str;
+    mainProgram = str;
     longDescription = str;
     branch = str;
     homepage = either (listOf str) str;