diff --git a/runner_system.nix b/runner_system.nix
index 0a7933e..e091e7d 100644
--- a/runner_system.nix
+++ b/runner_system.nix
@@ -39,9 +39,9 @@ in
         settings = {
           runner = {
             capacity = 4;
-            envs = [
-              "DOCKER_HOST=unix:///var/run/docker.sock"
-            ];
+            envs = {
+              DOCKER_HOST = "unix:///var/run/docker.sock";
+            };
           };
           container = {
             privileged = true;