diff --git a/src/aof.c b/src/aof.c
index c629bed47442473d166366ed215c0e22737ced6a..ac50d572d7042b017bce370ea7f5194dc27758fb 100644
--- a/src/aof.c
+++ b/src/aof.c
@@ -855,6 +855,7 @@ int rewriteAppendOnlyFile(char *filename) {
     }
 
     rioInitWithFile(&aof,fp);
+    rioSetAutoSync(&aof,REDIS_AOF_AUTOSYNC_BYTES);
     for (j = 0; j < server.dbnum; j++) {
         char selectcmd[] = "*2\r\n$6\r\nSELECT\r\n";
         redisDb *db = server.db+j;
diff --git a/src/redis.h b/src/redis.h
index d4f6b7f9370660138439afdc9a0a488addfa47d1..dbe23fe4045dfdf6a56230512a9dce1223973951 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -106,6 +106,7 @@
 #define REDIS_INLINE_MAX_SIZE   (1024*64) /* Max size of inline reads */
 #define REDIS_MBULK_BIG_ARG     (1024*32)
 #define REDIS_LONGSTR_SIZE      21          /* Bytes needed for long -> str */
+#define REDIS_AOF_AUTOSYNC_BYTES (1024*1024*32) /* fdatasync every 32MB */
 
 /* Hash table parameters */
 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */