diff --git a/vlib/builtin/option.v b/vlib/builtin/option.v
index 1f1bdd9b61..cc1a5a3149 100644
--- a/vlib/builtin/option.v
+++ b/vlib/builtin/option.v
@@ -87,3 +87,7 @@ pub fn (e &Error) free() {
 pub fn (n &None__) free() {
 	unsafe { n.msg.free() }
 }
+
+pub fn (_ none) str() string {
+	return 'none'
+}
diff --git a/vlib/v/tests/string_optional_none_test.v b/vlib/v/tests/string_optional_none_test.v
new file mode 100644
index 0000000000..c71cc00c6d
--- /dev/null
+++ b/vlib/v/tests/string_optional_none_test.v
@@ -0,0 +1,14 @@
+struct MyError {
+	code int
+	msg  string
+}
+
+fn foo() int | none | IError {
+	return IError(MyError{})
+}
+
+fn test_string_optional_none() {
+	x := foo()
+	println(x)
+	assert true
+}