diff --git a/pkgs/tools/graphics/pikchr/default.nix b/pkgs/tools/graphics/pikchr/default.nix
index d750d243fc36..5e390ce12cd3 100644
--- a/pkgs/tools/graphics/pikchr/default.nix
+++ b/pkgs/tools/graphics/pikchr/default.nix
@@ -52,5 +52,6 @@ stdenv.mkDerivation {
     license = licenses.bsd0;
     maintainers = with maintainers; [ fgaz ];
     platforms = platforms.all;
+    mainProgram = "pikchr";
   };
 }