diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index 69d239e..1037e49 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -471,23 +471,26 @@ class NixConfigure(buildstep.CommandMixin, steps.BuildStep):
         ci_buildbot_defn_exists = yield self.pathExists('build/.ci/buildbot.nix')
         if ci_buildbot_defn_exists:
             configure_log.addStdout(".ci/buildbot.nix found, configured for non-flake CI")
-            self.build.addStepAfterCurrentStep(
-                make_job_evaluator(
-                    "evaluate `.ci/buildbot.nix` jobs",
-                    self.evaluator_settings,
-                    False
-                )
+            self.build.addStepsAfterCurrentStep(
+                [
+                    make_job_evaluator(
+                        "evaluate `.ci/buildbot.nix` jobs",
+                        self.evaluator_settings,
+                        False
+                    )
+                ]
             )
 
         flake_exists = yield self.pathExists('build/flake.nix')
         if flake_exists:
             configure_log.addStdout(f"flake.nix found")
-            self.build.addStepAfterCurrentStep(
-                make_job_evaluator(
-                    "evaluate `flake.nix` jobs",
-                    self.evaluator_settings,
-                    True
-                )
+            self.build.addStepsAfterCurrentStep([
+                    make_job_evaluator(
+                        "evaluate `flake.nix` jobs",
+                        self.evaluator_settings,
+                        True
+                    )
+                ]
             )
             return