diff --git a/cbits/win32.c b/cbits/win32.c
--- a/cbits/win32.c
+++ b/cbits/win32.c
@@ -1,7 +1,6 @@
 #include "HsMsync.h"
 
-#include <sys/mman.h>
-
 int system_io_msync(void *ptr, size_t size, int hs_flags)
 {
+  /* TODO: Any need to msync in Windows? */
 }
diff --git a/keyvaluehash.cabal b/keyvaluehash.cabal
--- a/keyvaluehash.cabal
+++ b/keyvaluehash.cabal
@@ -1,5 +1,5 @@
 name:                keyvaluehash
-version:             0.3.1.1
+version:             0.3.1.2
 synopsis:            Pure Haskell key/value store implementation
 description:         A simple bytestring key/value store implemented
                      in terms of hash table over a file.