diff --git a/build/include/port/port_config.h b/build/include/port/port_config.h
index 0e80eda..3a646b3 100644
--- a/build/include/port/port_config.h
+++ b/build/include/port/port_config.h
@@ -6,9 +6,10 @@
 #define STORAGE_LEVELDB_PORT_PORT_CONFIG_H_
 
 // Define to 1 if you have a definition for fdatasync() in <unistd.h>.
-#if !defined(HAVE_FDATASYNC)
-#define HAVE_FDATASYNC 1
-#endif  // !defined(HAVE_FDATASYNC)
+// check mac build
+// #if !defined(HAVE_FDATASYNC)
+// #define HAVE_FDATASYNC 1
+// #endif  // !defined(HAVE_FDATASYNC)
 
 // Define to 1 if you have a definition for F_FULLFSYNC in <fcntl.h>.
 #if !defined(HAVE_FULLFSYNC)