diff --git a/pkg/runner/run_context.go b/pkg/runner/run_context.go
index 034aaf2..fdf996c 100644
--- a/pkg/runner/run_context.go
+++ b/pkg/runner/run_context.go
@@ -78,6 +78,7 @@ func (rc *RunContext) startJobContainer() common.Executor {
 		}
 
 		envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TOOL_CACHE", "/opt/hostedtoolcache"))
+		envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_OS", "Linux"))
 
 		binds := []string{
 			fmt.Sprintf("%s:%s", "/var/run/docker.sock", "/var/run/docker.sock"),
diff --git a/pkg/runner/step_context.go b/pkg/runner/step_context.go
index bfa9b0d..70039b5 100644
--- a/pkg/runner/step_context.go
+++ b/pkg/runner/step_context.go
@@ -164,6 +164,8 @@ func (sc *StepContext) newStepContainer(ctx context.Context, image string, cmd [
 	}
 
 	envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TOOL_CACHE", "/opt/hostedtoolcache"))
+	envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_OS", "Linux"))
+	envList = append(envList, fmt.Sprintf("%s=%s", "RUNNER_TEMP", "/tmp"))
 
 	binds := []string{
 		fmt.Sprintf("%s:%s", "/var/run/docker.sock", "/var/run/docker.sock"),