diff --git a/pkgs/tools/admin/afterburn/default.nix b/pkgs/tools/admin/afterburn/default.nix
index 8c5e4305602..0126d68ed2d 100644
--- a/pkgs/tools/admin/afterburn/default.nix
+++ b/pkgs/tools/admin/afterburn/default.nix
@@ -16,7 +16,7 @@ rustPlatform.buildRustPackage rec {
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ openssl ];
 
-  patchPhase = ''
+  postPatch = ''
     substituteInPlace ./systemd/afterburn-checkin.service --replace /usr/bin $out/bin
     substituteInPlace ./systemd/afterburn-firstboot-checkin.service --replace /usr/bin $out/bin
     substituteInPlace ./systemd/afterburn-sshkeys@.service.in --replace /usr/bin $out/bin