diff --git a/nixos/modules/system/boot/stage-2.nix b/nixos/modules/system/boot/stage-2.nix
index f6b6a8e4b0b4..fa2bf938df4f 100644
--- a/nixos/modules/system/boot/stage-2.nix
+++ b/nixos/modules/system/boot/stage-2.nix
@@ -47,36 +47,6 @@ in
         '';
       };
 
-      devSize = mkOption {
-        default = "5%";
-        example = "32m";
-        type = types.str;
-        description = ''
-          Size limit for the /dev tmpfs. Look at mount(8), tmpfs size option,
-          for the accepted syntax.
-        '';
-      };
-
-      devShmSize = mkOption {
-        default = "50%";
-        example = "256m";
-        type = types.str;
-        description = ''
-          Size limit for the /dev/shm tmpfs. Look at mount(8), tmpfs size option,
-          for the accepted syntax.
-        '';
-      };
-
-      runSize = mkOption {
-        default = "25%";
-        example = "256m";
-        type = types.str;
-        description = ''
-          Size limit for the /run tmpfs. Look at mount(8), tmpfs size option,
-          for the accepted syntax.
-        '';
-      };
-
       systemdExecutable = mkOption {
         default = "systemd";
         type = types.str;
diff --git a/nixos/modules/tasks/filesystems.nix b/nixos/modules/tasks/filesystems.nix
index f3da6771197e..d68edd8d7d39 100644
--- a/nixos/modules/tasks/filesystems.nix
+++ b/nixos/modules/tasks/filesystems.nix
@@ -215,6 +215,35 @@ in
       '';
     };
 
+    boot.devSize = mkOption {
+      default = "5%";
+      example = "32m";
+      type = types.str;
+      description = ''
+        Size limit for the /dev tmpfs. Look at mount(8), tmpfs size option,
+        for the accepted syntax.
+      '';
+    };
+
+    boot.devShmSize = mkOption {
+      default = "50%";
+      example = "256m";
+      type = types.str;
+      description = ''
+        Size limit for the /dev/shm tmpfs. Look at mount(8), tmpfs size option,
+        for the accepted syntax.
+      '';
+    };
+
+    boot.runSize = mkOption {
+      default = "25%";
+      example = "256m";
+      type = types.str;
+      description = ''
+        Size limit for the /run tmpfs. Look at mount(8), tmpfs size option,
+        for the accepted syntax.
+      '';
+    };
   };