diff --git a/bolt_ppc.go b/bolt_ppc.go
new file mode 100644
index 0000000..645ddc3
--- /dev/null
+++ b/bolt_ppc.go
@@ -0,0 +1,9 @@
+// +build ppc
+
+package bolt
+
+// maxMapSize represents the largest mmap size supported by Bolt.
+const maxMapSize = 0x7FFFFFFF // 2GB
+
+// maxAllocSize is the size used when creating array pointers.
+const maxAllocSize = 0xFFFFFFF