diff --git a/ibm/service/vpc/resource_ibm_is_instance_group_manager_policy.go b/ibm/service/vpc/resource_ibm_is_instance_group_manager_policy.go
index 118b4bf5bb..c2b21d3b91 100644
--- a/ibm/service/vpc/resource_ibm_is_instance_group_manager_policy.go
+++ b/ibm/service/vpc/resource_ibm_is_instance_group_manager_policy.go
@@ -193,6 +193,12 @@ func resourceIBMISInstanceGroupManagerPolicyUpdate(d *schema.ResourceData, meta
 		updateInstanceGroupManagerPolicyOptions.InstanceGroupID = &instanceGroupID
 		updateInstanceGroupManagerPolicyOptions.InstanceGroupManagerID = &instanceGroupManagerID
 
+		instanceGroupManagerPolicyAsPatch, asPatchErr := instanceGroupManagerPolicyPatchModel.AsPatch()
+		if asPatchErr != nil {
+			return fmt.Errorf("[ERROR] Error calling asPatch for InstanceGroupManagerPolicyPatchModel: %s", asPatchErr)
+		}
+		updateInstanceGroupManagerPolicyOptions.InstanceGroupManagerPolicyPatch = instanceGroupManagerPolicyAsPatch
+
 		isInsGrpKey := "Instance_Group_Key_" + instanceGroupID
 		conns.IbmMutexKV.Lock(isInsGrpKey)
 		defer conns.IbmMutexKV.Unlock(isInsGrpKey)