diff --git a/nix/scripts/run-ci-tests.nix b/nix/scripts/run-ci-tests.nix
index 9b11af361962828d53fba5cad62a980872b9b6f5..6bd9934be090e5825641db9bf742f6299d662b3b 100644
--- a/nix/scripts/run-ci-tests.nix
+++ b/nix/scripts/run-ci-tests.nix
@@ -5,7 +5,7 @@
 }: pkgs.writeShellScriptBin "run-ci-tests" ''
     echo "run ci tests"
 
-    if [ -n "''${CI_JOB_TOKEN}" ]; then
+    if [ -z "''${CI_JOB_TOKEN}" ]; then
        echo "You are in a CI environment, this shell is not intended for CI, but for local development"
        exit 1
     fi