diff --git a/sys/kern/vfs_syscalls.c b/sys/kern/vfs_syscalls.c
--- a/sys/kern/vfs_syscalls.c
+++ b/sys/kern/vfs_syscalls.c
@@ -1119,7 +1119,7 @@
 	if (flags & O_TRUNC)
 		cap_rights_set_one(rightsp, CAP_FTRUNCATE);
 
-	if (flags & (O_SYNC | O_FSYNC))
+	if (flags & (O_SYNC | O_FSYNC | O_DSYNC))
 		cap_rights_set_one(rightsp, CAP_FSYNC);
 
 	if (flags & (O_EXLOCK | O_SHLOCK))