1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/compilers/urweb/default.nix b/nixpkgs/pkgs/development/compilers/urweb/default.nix
index b72548e753c3..2621f4bc8050 100644
--- a/nixpkgs/pkgs/development/compilers/urweb/default.nix
+++ b/nixpkgs/pkgs/development/compilers/urweb/default.nix
@@ -43,6 +43,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     description = "Advanced purely-functional web programming language";
+    mainProgram = "urweb";
     homepage    = "http://www.impredicative.com/ur/";
     license     = lib.licenses.bsd3;
     platforms   = lib.platforms.linux ++ lib.platforms.darwin;