diff --git a/cbits/posix.c b/cbits/posix.c
--- a/cbits/posix.c
+++ b/cbits/posix.c
@@ -8,7 +8,7 @@
 #include <sys/mman.h>
 #include <fcntl.h>
 #include <unistd.h>
-#include <malloc.h>
+#include <stdlib.h>
 #include <sys/errno.h>
 
 //foreign import ccall unsafe "system_io_mmap_file_open" c_system_io_mmap_file_open :: CString -> CInt -> IO (Ptr ())
diff --git a/mmap.cabal b/mmap.cabal
--- a/mmap.cabal
+++ b/mmap.cabal
@@ -1,5 +1,5 @@
 Name: mmap
-Version: 0.4
+Version: 0.4.1
 Stability: alpha
 License: BSD3
 License-File: LICENSE