diff --git a/pkgs/development/interpreters/femtolisp/default.nix b/pkgs/development/interpreters/femtolisp/default.nix
index 06a4f635b3a6..ecd3bc1f8fd7 100644
--- a/pkgs/development/interpreters/femtolisp/default.nix
+++ b/pkgs/development/interpreters/femtolisp/default.nix
@@ -36,5 +36,6 @@ stdenv.mkDerivation {
     maintainers = with lib.maintainers; [ moody ];
     broken = stdenv.isDarwin;
     platforms = lib.platforms.unix;
+    mainProgram = "flisp";
   };
 }