diff --git a/mmv1/products/filestore/Instance.yaml b/mmv1/products/filestore/Instance.yaml
index 12ca3ef1d256..64bc35e5274e 100644
--- a/mmv1/products/filestore/Instance.yaml
+++ b/mmv1/products/filestore/Instance.yaml
@@ -213,6 +213,10 @@ properties:
             A /29 CIDR block that identifies the range of IP
             addresses reserved for this instance.
           default_from_api: true
+          # When using connectMode=PRIVATE_SERVICE_ACCESS, the returned value
+          # won't match the sent value as the returned value is an IP range
+          # from the provided named range.
+          custom_flatten: templates/terraform/custom_flatten/filestore_instance_networks_reserved_ip_range.go.erb
         - !ruby/object:Api::Type::Array
           name: 'ipAddresses'
           description: |
diff --git a/mmv1/templates/terraform/custom_flatten/filestore_instance_networks_reserved_ip_range.go.erb b/mmv1/templates/terraform/custom_flatten/filestore_instance_networks_reserved_ip_range.go.erb
new file mode 100644
index 000000000000..fbeda7892254
--- /dev/null
+++ b/mmv1/templates/terraform/custom_flatten/filestore_instance_networks_reserved_ip_range.go.erb
@@ -0,0 +1,17 @@
+<%# The license inside this block applies to this file.
+	# Copyright 2018 Google Inc.
+	# Licensed under the Apache License, Version 2.0 (the "License");
+	# you may not use this file except in compliance with the License.
+	# You may obtain a copy of the License at
+	#
+	#     http://www.apache.org/licenses/LICENSE-2.0
+	#
+	# Unless required by applicable law or agreed to in writing, software
+	# distributed under the License is distributed on an "AS IS" BASIS,
+	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+	# See the License for the specific language governing permissions and
+	# limitations under the License.
+-%>
+func flatten<%= prefix -%><%= titlelize_property(property) -%>(v interface{}, d *schema.ResourceData, config *transport_tpg.Config) interface{} {
+	return d.Get("networks.0.reserved_ip_range")
+}
diff --git a/mmv1/third_party/terraform/services/filestore/resource_filestore_instance_test.go b/mmv1/third_party/terraform/services/filestore/resource_filestore_instance_test.go
index 04ae0db3a6cf..96d44c1c8244 100644
--- a/mmv1/third_party/terraform/services/filestore/resource_filestore_instance_test.go
+++ b/mmv1/third_party/terraform/services/filestore/resource_filestore_instance_test.go
@@ -134,7 +134,7 @@ func TestAccFilestoreInstance_reservedIpRange_update(t *testing.T) {
 				ResourceName:            "google_filestore_instance.instance",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"zone", "location"},
+				ImportStateVerifyIgnore: []string{"zone", "location", "networks.0.reserved_ip_range"},
 			},
 			{
 				Config: testAccFilestoreInstance_reservedIpRange_update2(name),
@@ -143,7 +143,7 @@ func TestAccFilestoreInstance_reservedIpRange_update(t *testing.T) {
 				ResourceName:            "google_filestore_instance.instance",
 				ImportState:             true,
 				ImportStateVerify:       true,
-				ImportStateVerifyIgnore: []string{"zone", "location"},
+				ImportStateVerifyIgnore: []string{"zone", "location", "networks.0.reserved_ip_range"},
 			},
 		},
 	})