diff --git a/systems/bob/hardware.nix b/systems/bob/hardware.nix
index e835d47..738ccdc 100644
--- a/systems/bob/hardware.nix
+++ b/systems/bob/hardware.nix
@@ -50,6 +50,11 @@
       fsType = "zfs";
     };
 
+    "/nix_build" = {
+      device = "root_pool/nix_build";
+      fsType = "zfs";
+    };
+
     "/var" = {
       device = "root_pool/var";
       fsType = "zfs";
diff --git a/systems/brain/hardware.nix b/systems/brain/hardware.nix
index f830163..f17d099 100644
--- a/systems/brain/hardware.nix
+++ b/systems/brain/hardware.nix
@@ -53,6 +53,11 @@
       fsType = "zfs";
     };
 
+    "/nix_build" = {
+      device = "root_pool/nix_build";
+      fsType = "zfs";
+    };
+
     "/boot" = {
       device = "/dev/disk/by-uuid/12CE-A600";
       fsType = "vfat";
diff --git a/systems/jeeves/hardware.nix b/systems/jeeves/hardware.nix
index 0358e43..a7b957d 100644
--- a/systems/jeeves/hardware.nix
+++ b/systems/jeeves/hardware.nix
@@ -96,6 +96,11 @@ in
       fsType = "zfs";
     };
 
+    "/nix_build" = {
+      device = "root_pool/nix_build";
+      fsType = "zfs";
+    };
+
     "/var" = {
       device = "root_pool/var";
       fsType = "zfs";
diff --git a/systems/rhapsody-in-green/hardware.nix b/systems/rhapsody-in-green/hardware.nix
index 7b15c5e..277cce4 100644
--- a/systems/rhapsody-in-green/hardware.nix
+++ b/systems/rhapsody-in-green/hardware.nix
@@ -34,14 +34,22 @@
       device = "root_pool/root";
       fsType = "zfs";
     };
+
     "/home" = {
       device = "root_pool/home";
       fsType = "zfs";
     };
+
+    "/nix_build" = {
+      device = "root_pool/nix_build";
+      fsType = "zfs";
+    };
+
     "/var" = {
       device = "root_pool/var";
       fsType = "zfs";
     };
+
     "/boot" = {
       device = "/dev/disk/by-uuid/12CE-A600";
       fsType = "vfat";