diff --git a/src/Runner.Worker/JobRunner.cs b/src/Runner.Worker/JobRunner.cs
index 3a30f1c8727..e402d4ca824 100644
--- a/src/Runner.Worker/JobRunner.cs
+++ b/src/Runner.Worker/JobRunner.cs
@@ -106,6 +106,7 @@ public async Task<TaskResult> RunAsync(Pipelines.AgentJobRequestMessage message,
                 }
 
                 jobContext.SetRunnerContext("os", VarUtil.OS);
+                jobContext.SetRunnerContext("arch", VarUtil.OSArchitecture);
 
                 var runnerSettings = HostContext.GetService<IConfigurationStore>().GetSettings();
                 jobContext.SetRunnerContext("name", runnerSettings.AgentName);