diff --git a/pkgs/development/interpreters/evcxr/default.nix b/pkgs/development/interpreters/evcxr/default.nix
index 8625eab28aca..d4520719a7e8 100644
--- a/pkgs/development/interpreters/evcxr/default.nix
+++ b/pkgs/development/interpreters/evcxr/default.nix
@@ -73,5 +73,6 @@ rustPlatform.buildRustPackage rec {
       protoben
       ma27
     ];
+    mainProgram = "evcxr";
   };
 }