diff --git a/modules/system/activation-scripts.nix b/modules/system/activation-scripts.nix
index 450d65b..9140163 100644
--- a/modules/system/activation-scripts.nix
+++ b/modules/system/activation-scripts.nix
@@ -68,6 +68,11 @@ in
 
       ${cfg.activationScripts.postActivation.text}
 
+      # Ensure /run exists.
+      if [ ! -e /run ]; then
+        ln -sfn private/var/run /run
+      fi
+
       # Make this configuration the current configuration.
       # The readlink is there to ensure that when $systemConfig = /system
       # (which is a symlink to the store), /run/current-system is still