diff --git a/configuration.nix b/configuration.nix
index a7fb730..1a667c4 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -174,44 +174,8 @@
 
     lsof
 
-    (pkgs.writeShellApplication {
-      name = "disk-smart-test";
-      runtimeInputs = with pkgs; [
-        gnugrep
-        coreutils
-        smartmontools
-      ];
-
-      text = ''
-        #!/bin/sh
-        set -e
-        if [[ $EUID -ne 0 ]]; then
-          echo "This command requires root."
-          exit 2
-        fi
-
-        for i in /dev/disk/by-id/*; do
-          case "$i" in
-           *\\-part[0-9]*) continue ;;
-          esac
-          echo -n "$i "
-          smartctl -a "$i" | grep "SMART overall-health self-assessment test result:" | cut -d' ' -f6
-        done
-      '';
-    })
-
-    (pkgs.writeShellApplication {
-      name = "reflac";
-      runtimeInputs = with pkgs; [ flac ];
-      excludeShellChecks = [ "2086" ];
-
-      text = builtins.readFile (
-        pkgs.fetchurl {
-          url = "https://raw.githubusercontent.com/chungy/reflac/refs/heads/master/reflac";
-          sha256 = "61c6cc8be3d276c6714e68b55e5de0e6491f50bbf195233073dbce14a1e278a7";
-        }
-      );
-    })
+    disk-smart-test
+    reflac
 
     pfetch-rs
 
diff --git a/overlays.nix b/overlays.nix
index dc58d37..38d0f99 100644
--- a/overlays.nix
+++ b/overlays.nix
@@ -30,4 +30,43 @@ final: prev: {
        fi
     '';
   };
+
+  disk-smart-test = prev.writeShellApplication {
+    name = "disk-smart-test";
+    runtimeInputs = with prev; [
+      gnugrep
+      coreutils
+      smartmontools
+    ];
+
+    text = ''
+      #!/bin/sh
+      set -e
+      if [[ $EUID -ne 0 ]]; then
+        echo "This command requires root."
+        exit 2
+      fi
+
+      for i in /dev/disk/by-id/*; do
+        case "$i" in
+         *\\-part[0-9]*) continue ;;
+        esac
+        echo -n "$i "
+        smartctl -a "$i" | grep "SMART overall-health self-assessment test result:" | cut -d' ' -f6
+      done
+    '';
+  };
+
+  reflac = prev.writeShellApplication {
+    name = "reflac";
+    runtimeInputs = with prev; [ flac ];
+    excludeShellChecks = [ "2086" ];
+
+    text = builtins.readFile (
+      prev.fetchurl {
+        url = "https://raw.githubusercontent.com/chungy/reflac/refs/heads/master/reflac";
+        sha256 = "61c6cc8be3d276c6714e68b55e5de0e6491f50bbf195233073dbce14a1e278a7";
+      }
+    );
+  };
 }