diff --git a/objc/call_arm64.go b/objc/call_arm64.go
index 1f6a0cb2..d06d5f54 100644
--- a/objc/call_arm64.go
+++ b/objc/call_arm64.go
@@ -11,6 +11,7 @@ import "C"
 import (
 	"math"
 	"reflect"
+	"strings"
 	"unsafe"
 )