diff --git a/bolt_ppc64le.go b/bolt_ppc64le.go
new file mode 100644
index 00000000..8351e129
--- /dev/null
+++ b/bolt_ppc64le.go
@@ -0,0 +1,9 @@
+// +build ppc64le
+
+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
diff --git a/bolt_s390x.go b/bolt_s390x.go
new file mode 100644
index 00000000..f4dd26bb
--- /dev/null
+++ b/bolt_s390x.go
@@ -0,0 +1,9 @@
+// +build s390x
+
+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