diff --git a/src/main/java/org/springframework/cloud/servicebroker/model/UpdateServiceInstanceRequest.java b/src/main/java/org/springframework/cloud/servicebroker/model/UpdateServiceInstanceRequest.java
index 4697c165..e712bdfe 100644
--- a/src/main/java/org/springframework/cloud/servicebroker/model/UpdateServiceInstanceRequest.java
+++ b/src/main/java/org/springframework/cloud/servicebroker/model/UpdateServiceInstanceRequest.java
@@ -33,7 +33,6 @@ public class UpdateServiceInstanceRequest extends AsyncParameterizedServiceInsta
 	/**
 	 * The ID of the plan to update within the service, from the broker catalog.
 	 */
-	@NotEmpty
 	@JsonSerialize
 	@JsonProperty("plan_id")
 	private final String planId;