diff --git a/nixos/modules/system/boot/systemd-unit-options.nix b/nixos/modules/system/boot/systemd-unit-options.nix
index bee21f1a8f36..62398f27d088 100644
--- a/nixos/modules/system/boot/systemd-unit-options.nix
+++ b/nixos/modules/system/boot/systemd-unit-options.nix
@@ -233,6 +233,7 @@ in rec {
 
     path = mkOption {
       default = [];
+      type = with types; listOf package;
       apply = ps: "${makeBinPath ps}:${makeSearchPathOutput "bin" "sbin" ps}";
       description = ''
         Packages added to the service's <envar>PATH</envar>