diff --git a/doc/build-helpers/images/dockertools.section.md b/doc/build-helpers/images/dockertools.section.md
index bd89c73c174cd..199d93ae48fa0 100644
--- a/doc/build-helpers/images/dockertools.section.md
+++ b/doc/build-helpers/images/dockertools.section.md
@@ -909,7 +909,7 @@ Writing manifest to image destination
 {
   imageName = "nixos/nix";
   imageDigest = "sha256:498fa2d7f2b5cb3891a4edf20f3a8f8496e70865099ba72540494cd3e2942634";
-  sha256 = "1q6cf2pdrasa34zz0jw7pbs6lvv52rq2aibgxccbwcagwkg2qj1q";
+  hash = "sha256-OEgs3uRPMb4Y629FJXAWZW9q9LqHS/A/GUqr3K5wzOA=";
   finalImageName = "nixos/nix";
   finalImageTag = "latest";
 }
diff --git a/pkgs/build-support/docker/nix-prefetch-docker b/pkgs/build-support/docker/nix-prefetch-docker
index f551d37cda96f..058c0be66ae45 100755
--- a/pkgs/build-support/docker/nix-prefetch-docker
+++ b/pkgs/build-support/docker/nix-prefetch-docker
@@ -133,7 +133,7 @@ else
 fi
 
 # Compute the hash.
-imageHash=$(nix-hash --flat --type $hashType --base32 "$tmpFile")
+imageHash=$(nix-hash --flat --type $hashType --sri "$tmpFile")
 
 # Add the downloaded file to Nix store.
 finalPath=$(nix-store --add-fixed "$hashType" "$tmpFile")
@@ -152,7 +152,7 @@ cat <<EOF
 {
   imageName = "$imageName";
   imageDigest = "$imageDigest";
-  sha256 = "$imageHash";
+  hash = "$imageHash";
   finalImageName = "$finalImageName";
   finalImageTag = "$finalImageTag";
 }
@@ -164,7 +164,7 @@ cat <<EOF
 {
   "imageName": "$imageName",
   "imageDigest": "$imageDigest",
-  "sha256": "$imageHash",
+  "hash": "$imageHash",
   "finalImageName": "$finalImageName",
   "finalImageTag": "$finalImageTag"
 }