diff --git a/systems/x86_64-linux/matt-nixos/default.nix b/systems/x86_64-linux/matt-nixos/default.nix
index 6e0ece2..a770780 100644
--- a/systems/x86_64-linux/matt-nixos/default.nix
+++ b/systems/x86_64-linux/matt-nixos/default.nix
@@ -53,7 +53,17 @@
       };
     };
 
-    impermanence.enable = true;
+    impermanence = {
+      enable = true;
+      extraDirectories = [
+        {
+          directory = "/var/cache/ccache";
+          user = "nobody";
+          group = "nobody";
+          mode = "u=rwx,g=rwx,o=rx";
+        }
+      ];
+    };
 
     network = {
       hostName = "matt-nixos";