diff --git a/pkgs/by-name/pr/proxmox-backup-client/package.nix b/pkgs/by-name/pr/proxmox-backup-client/package.nix
index e19b41c293c6..8350bd9f1684 100644
--- a/pkgs/by-name/pr/proxmox-backup-client/package.nix
+++ b/pkgs/by-name/pr/proxmox-backup-client/package.nix
@@ -118,7 +118,7 @@ rustPlatform.buildRustPackage {
   postBuild = ''
     make -C docs \
       DEB_VERSION=${version} DEB_VERSION_UPSTREAM=${version} \
-      RUSTC_TARGET=${stdenv.hostPlatform.config} \
+      RUSTC_TARGET=${stdenv.targetPlatform.rust.rustcTarget} \
       BUILD_MODE=release \
       proxmox-backup-client.1 pxar.1
   '';