diff --git a/roles/host_common.nix b/roles/host_common.nix
index 57df560..923107a 100644
--- a/roles/host_common.nix
+++ b/roles/host_common.nix
@@ -4,10 +4,14 @@
 
 {
 
-  imports =
-    [
-      ./tmux.nix
-    ];
+  imports = [
+    ./tmux.nix
+  ];
+
+  # Common boot settings
+  boot = {
+    cleanTmpDir = true;   # Clean /tmp on reboot
+  };
 
   # Select internationalisation properties.
   i18n = {