diff --git a/translate.go b/translate.go
index 99a52acf5..695e38f91 100644
--- a/translate.go
+++ b/translate.go
@@ -24,8 +24,6 @@ const (
 )
 
 const (
-	DefaultMapSize = 10 * (1 << 30) // 10GB
-
 	DefaultReplicationRetryInterval = 1 * time.Second
 )
 
diff --git a/translate_mapsize_386.go b/translate_mapsize_386.go
new file mode 100644
index 000000000..b8beafa13
--- /dev/null
+++ b/translate_mapsize_386.go
@@ -0,0 +1,5 @@
+package pilosa
+
+// DefaultMapSize is the default size of mapped memory for the translate store.
+// It is passed as an int to syscall.Mmap and so must be < 2^31
+const DefaultMapSize = (1 << 31) - 1 // 2GB
diff --git a/translate_mapsize_all64bitsystems.go b/translate_mapsize_all64bitsystems.go
new file mode 100644
index 000000000..5275c6ec5
--- /dev/null
+++ b/translate_mapsize_all64bitsystems.go
@@ -0,0 +1,8 @@
+// +build !386
+
+package pilosa
+
+// DefaultMapSize is the default size of mapped memory for the translate store.
+// It is passed as an int to syscall.Mmap and so can only be larger than 2^31 on
+// 64bit systems.
+const DefaultMapSize = 10 * (1 << 30) // 10GB