diff --git a/pkgs/pkgs-lib/formats.nix b/pkgs/pkgs-lib/formats.nix
index 556290be5f4e..8afccf3e0348 100644
--- a/pkgs/pkgs-lib/formats.nix
+++ b/pkgs/pkgs-lib/formats.nix
@@ -76,8 +76,9 @@ rec {
 
   };
 
-  yaml = {}: {
+  yaml = yaml_1_1;
 
+  yaml_1_1 = {}: {
     generate = name: value: pkgs.callPackage ({ runCommand, remarshal_0_17 }: runCommand name {
       nativeBuildInputs = [ remarshal_0_17 ];
       value = builtins.toJSON value;