diff --git a/builtin/providers/google/resource_compute_target_pool.go b/builtin/providers/google/resource_compute_target_pool.go
index <HASH>..<HASH> 100644
--- a/builtin/providers/google/resource_compute_target_pool.go
+++ b/builtin/providers/google/resource_compute_target_pool.go
@@ -82,6 +82,7 @@ func resourceComputeTargetPool() *schema.Resource {
 				Type:     schema.TypeString,
 				Optional: true,
 				ForceNew: true,
+				Default:  "NONE",
 			},
 		},
 	}
Change google_compute_target_pool's session_affinity field default to NONE. (#<I>)