diff --git a/parser/mount.cc b/parser/mount.cc
index f3b9c01a4..9b4e84ae2 100644
--- a/parser/mount.cc
+++ b/parser/mount.cc
@@ -247,8 +247,8 @@ static struct mnt_keyword_table mnt_opts_table[] = {
 	{"nodev",		MS_NODEV, 0},
 	{"exec",		0, MS_NOEXEC},
 	{"noexec",		MS_NOEXEC, 0},
-	{"sync",		MS_SYNC, 0},
-	{"async",		0, MS_SYNC},
+	{"sync",		MS_SYNCHRONOUS, 0},
+	{"async",		0, MS_SYNCHRONOUS},
 	{"remount",		MS_REMOUNT, 0},
 	{"mand",		MS_MAND, 0},
 	{"nomand",		0, MS_MAND},
diff --git a/parser/mount.h b/parser/mount.h
index e6bdd01b5..48d8e6b5c 100644
--- a/parser/mount.h
+++ b/parser/mount.h
@@ -35,7 +35,7 @@
 #define MS_DEV		0
 #define MS_NOEXEC	(1 << 3)
 #define MS_EXEC		0
-#define MS_SYNC		(1 << 4)
+#define MS_SYNCHRONOUS		(1 << 4)
 #define MS_ASYNC	0
 #define MS_REMOUNT	(1 << 5)
 #define MS_MAND		(1 << 6)
@@ -78,7 +78,7 @@
 #define MS_RSHARED	(MS_SHARED | MS_REC)
 
 #define MS_ALL_FLAGS	(MS_RDONLY | MS_NOSUID | MS_NODEV | MS_NOEXEC | \
-			 MS_SYNC | MS_REMOUNT | MS_MAND | MS_DIRSYNC | \
+			 MS_SYNCHRONOUS | MS_REMOUNT | MS_MAND | MS_DIRSYNC | \
 			 MS_NOSYMFOLLOW | \
 			 MS_NOATIME | MS_NODIRATIME | MS_BIND | MS_RBIND | \
 			 MS_MOVE | MS_VERBOSE | MS_ACL | \