diff --git a/bolt_arm64.go b/bolt_arm64.go
new file mode 100644
index 0000000..cca6b7e
--- /dev/null
+++ b/bolt_arm64.go
@@ -0,0 +1,7 @@
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0xFFFFFFFFFFFF // 256TB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0x7FFFFFFF