diff --git a/hosts/fred/default.nix b/hosts/fred/default.nix
index ee8d156..50b3a42 100644
--- a/hosts/fred/default.nix
+++ b/hosts/fred/default.nix
@@ -17,7 +17,7 @@
   networking.hostName = "fred";
   variables.address = "100.72.236.170";
   boot = {
-    binfmt.emulatedSystems = lib.optional (config.system != "aarch64-linux") [ "aarch64-linux" ];
+    binfmt.emulatedSystems = lib.optionals (config.system != "aarch64-linux") [ "aarch64-linux" ];
     loader = {
       systemd-boot = {enable = true;};
       efi = {
diff --git a/hosts/server/default.nix b/hosts/server/default.nix
index 2008a16..8fcbd51 100644
--- a/hosts/server/default.nix
+++ b/hosts/server/default.nix
@@ -65,7 +65,7 @@ in {
 
   # Bootloader.
   boot = {
-    binfmt.emulatedSystems = lib.optional (config.system != "aarch64-linux") [ "aarch64-linux" ];
+    binfmt.emulatedSystems = lib.optionals (config.system != "aarch64-linux") [ "aarch64-linux" ];
     kernelPackages = pkgs.linuxPackages_latest;
     kernelParams = ["consoleblank=60"];
     #loader = {
diff --git a/hosts/workstation/default.nix b/hosts/workstation/default.nix
index e1ad8b4..ce28ac8 100644
--- a/hosts/workstation/default.nix
+++ b/hosts/workstation/default.nix
@@ -164,7 +164,7 @@ in {
 
   # Bootloader.
   boot = {
-    binfmt.emulatedSystems = lib.optional (config.system != "aarch64-linux") [ "aarch64-linux" ];
+    binfmt.emulatedSystems = lib.optionals (config.system != "aarch64-linux") [ "aarch64-linux" ];
     # kernelPackages = pkgs.linuxPackages_latest;
     kernelPackages = pkgs.linuxPackages_zen;
     kernelParams = ["consoleblank=60" "mem_sleep_default=deep"];