diff --git a/lib/modules/partition/disks.nix b/lib/modules/partition/disks.nix
index e8764a2f..ba783123 100644
--- a/lib/modules/partition/disks.nix
+++ b/lib/modules/partition/disks.nix
@@ -91,9 +91,14 @@ let
               type);
 
         fdiskCommand = arguments: "sudo sfdisk ${arguments}";
-        fdiskScript = script: append: "echo ${script} | ${fdiskCommand "${if append then "--append" else ""} ${diskVar}"}";
-        wipeScript = script: fdiskScript script false;
-        appendScript = script: fdiskScript script true;
+        fdiskScript = script: args: append:
+          "echo ${script} | ${
+            fdiskCommand "${builtins.concatStringsSep " " args} ${
+              if append then "--append" else ""
+            } ${diskVar}"
+          }";
+        wipeScript = script: fdiskScript script [] false;
+        appendScript = index: script: fdiskScript script ["-N" (builtins.toString index)] true;
 
         cleanup = lib.strings.concatLines (builtins.map
           (partition: "${fdiskCommand "--delete ${diskVar} ${toString partition.index}"} || true")
@@ -130,7 +135,7 @@ let
                 };
 
                 create = lib.strings.concatLines [
-                  (appendScript ''${toString index}: "$(${sizeOption})" type=${mkType type}'')
+                  (appendScript index ''${toString index}: "$(${sizeOption})" type=${mkType type}'')
                   probeScript
                   "sudo ${formatScripts.${format}}"
                 ];