diff --git a/rw_core/mocks/adapter_olt.go b/rw_core/mocks/adapter_olt.go
index 08f6e60..f23df4d 100644
--- a/rw_core/mocks/adapter_olt.go
+++ b/rw_core/mocks/adapter_olt.go
@@ -20,6 +20,7 @@
 	"context"
 	"errors"
 	"fmt"
+	"github.com/opencord/voltha-protos/v4/go/extension"
 	"strings"
 
 	"github.com/gogo/protobuf/proto"
@@ -132,6 +133,13 @@
 	return nil
 }
 
+// Single_get_value_request retrieves a single value.
+func (oltA *OLTAdapter) Single_get_value_request(ctx context.Context, // nolint
+	request extension.SingleGetValueRequest) (*extension.SingleGetValueResponse, error) {
+	logger.Fatalf(ctx, "Single_get_value_request unimplemented")
+	return nil, nil
+}
+
 // Get_ofp_device_info returns ofp device info
 func (oltA *OLTAdapter) Get_ofp_device_info(ctx context.Context, device *voltha.Device) (*ic.SwitchCapability, error) { // nolint
 	if d := oltA.getDevice(device.Id); d == nil {