1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/applications/science/math/calculix/default.nix b/nixpkgs/pkgs/applications/science/math/calculix/default.nix
index 7a89fdd73c84..8af2ea9f4bce 100644
--- a/nixpkgs/pkgs/applications/science/math/calculix/default.nix
+++ b/nixpkgs/pkgs/applications/science/math/calculix/default.nix
@@ -37,6 +37,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     homepage = "http://www.calculix.de/";
     description = "Three-dimensional structural finite element program";
+    mainProgram = "ccx";
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ gebner ];
     platforms = platforms.unix;