diff --git a/runtime/src/main/cpp/KString.cpp b/runtime/src/main/cpp/KString.cpp
index f2491826c58..79d90bf823d 100644
--- a/runtime/src/main/cpp/KString.cpp
+++ b/runtime/src/main/cpp/KString.cpp
@@ -728,7 +728,7 @@ OBJ_GETTER(Kotlin_String_fromUtf8Array, KConstRef thiz, KInt start, KInt size) {
   }
   const char* rawString =
     reinterpret_cast<const char*>(ByteArrayAddressOfElementAt(array, start));
-  RETURN_RESULT_OF(utf8ToUtf16, rawString, array->count_);
+  RETURN_RESULT_OF(utf8ToUtf16, rawString, size);
 }
 
 OBJ_GETTER(Kotlin_String_toUtf8Array, KString thiz, KInt start, KInt size) {