diff --git a/internal/proto/writer.go b/internal/proto/writer.go
index 78595cc4..fed169b6 100644
--- a/internal/proto/writer.go
+++ b/internal/proto/writer.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"reflect"
 	"strconv"
 	"time"
 
@@ -140,6 +141,36 @@ func (w *Writer) WriteArg(v interface{}) error {
 		return w.bytes(b)
 	case net.IP:
 		return w.bytes(v)
+	default:
+		return w.writeArgExtra(v)
+	}
+}
+
+func (w *Writer) writeArgExtra(v interface{}) error {
+	var (
+		rfValue = reflect.ValueOf(v)
+		rfKind  = rfValue.Kind()
+	)
+
+	switch rfKind {
+	case reflect.Bool:
+		if rfValue.Bool() {
+			return w.int(1)
+		}
+		return w.int(0)
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+		return w.int(rfValue.Int())
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
+		return w.uint(rfValue.Uint())
+	case reflect.Float32, reflect.Float64:
+		return w.float(rfValue.Float())
+	case reflect.String:
+		return w.string(rfValue.String())
+	case reflect.Slice:
+		if rfValue.Type().Elem().Kind() == reflect.Uint8 {
+			return w.bytes(rfValue.Bytes())
+		}
+		fallthrough
 	default:
 		return fmt.Errorf(
 			"redis: can't marshal %T (implement encoding.BinaryMarshaler)", v)
diff --git a/redis_test.go b/redis_test.go
index b5cf2570..e07b67e5 100644
--- a/redis_test.go
+++ b/redis_test.go
@@ -363,6 +363,20 @@ var _ = Describe("Client", func() {
 
 		Expect(ip2).To(Equal(ip))
 	})
+
+	It("should set and scan custom type", func() {
+		type customString string
+
+		val := customString("hello")
+		err := client.Set(ctx, "custom", val, 0).Err()
+		Expect(err).NotTo(HaveOccurred())
+
+		var val2 string
+		err = client.Get(ctx, "custom").Scan(&val2)
+		Expect(err).NotTo(HaveOccurred())
+
+		Expect(customString(val2)).To(Equal(val))
+	})
 })
 
 var _ = Describe("Client timeout", func() {