diff --git a/innobase/os/os0file.c b/innobase/os/os0file.c
index bab043fc746..b8339134fb1 100644
--- a/innobase/os/os0file.c
+++ b/innobase/os/os0file.c
@@ -6,8 +6,6 @@ The interface to the operating system file i/o primitives
 Created 10/21/1995 Heikki Tuuri
 *******************************************************/
 
-#define HAVE_BROKEN_PREAD
-
 #include "os0file.h"
 #include "os0sync.h"
 #include "os0thread.h"
@@ -16,6 +14,8 @@ Created 10/21/1995 Heikki Tuuri
 #include "fil0fil.h"
 #include "buf0buf.h"
 
+#undef HAVE_FDATASYNC
+
 #ifdef POSIX_ASYNC_IO
 /* We assume in this case that the OS has standard Posix aio (at least SunOS
 2.6, HP-UX 11i and AIX 4.3 have) */