diff --git a/src/net/torvald/UnsafePtr.kt b/src/net/torvald/UnsafePtr.kt
index 5820f48d4..992920406 100644
--- a/src/net/torvald/UnsafePtr.kt
+++ b/src/net/torvald/UnsafePtr.kt
@@ -44,7 +44,7 @@ internal object UnsafeHelper {
      *
      * @return offset from the array's base memory address (aka pointer) that the actual data begins.
      */
-    fun getArrayOffset(obj: Any) = unsafe.arrayBaseOffset(obj.javaClass)
+    fun getArrayOffset(obj: Any) = unsafe.arrayBaseOffset(obj.javaClass).toLong()
 }
 
 /**