diff --git a/pkgs/applications/networking/cluster/rke2/builder.nix b/pkgs/applications/networking/cluster/rke2/builder.nix
index 68fe28b50075..bb2381c8f9a0 100644
--- a/pkgs/applications/networking/cluster/rke2/builder.nix
+++ b/pkgs/applications/networking/cluster/rke2/builder.nix
@@ -75,7 +75,7 @@ buildGoModule (finalAttrs: {
   ];
 
   # Passing boringcrypto to GOEXPERIMENT variable to build with goboring library
-  GOEXPERIMENT = "boringcrypto";
+  env.GOEXPERIMENT = "boringcrypto";
 
   # https://github.com/rancher/rke2/blob/104ddbf3de65ab5490aedff36df2332d503d90fe/scripts/build-binary#L27-L39
   ldflags =