diff --color -rupN a/dlls/ntdll/unix/fsync.c b/dlls/ntdll/unix/fsync.c
--- a/dlls/ntdll/unix/fsync.c
+++ b/dlls/ntdll/unix/fsync.c
@@ -51,6 +51,7 @@

 #include "unix_private.h"
 #include "fsync.h"
+#include <linux/futex.h>

 WINE_DEFAULT_DEBUG_CHANNEL(fsync);