diff --git a/containerd/driver.go b/containerd/driver.go
index 661ac4d..400e956 100644
--- a/containerd/driver.go
+++ b/containerd/driver.go
@@ -77,7 +77,7 @@ var (
 			hclspec.NewAttr("enabled", "bool", false),
 			hclspec.NewLiteral("true"),
 		),
-		"containerd_runtime": hclspec.NewAttr("containerd_runtime", "string", true),
+		"containerd_runtime": hclspec.NewAttr("containerd_runtime", "string", false),
 		"stats_interval":     hclspec.NewAttr("stats_interval", "string", false),
 		"allow_privileged": hclspec.NewDefault(
 			hclspec.NewAttr("allow_privileged", "bool", false),