diff --git a/fs/statfs.c b/fs/statfs.c
index 4e4623c7a1260eafaf564e87b4812091a9b3eb0e..c1dfc374e3c178adb1c973b78631a4e90befba5e 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -38,6 +38,8 @@ static int flags_by_sb(int s_flags)
 		flags |= ST_SYNCHRONOUS;
 	if (s_flags & MS_MANDLOCK)
 		flags |= ST_MANDLOCK;
+	if (s_flags & MS_RDONLY)
+		flags |= ST_RDONLY;
 	return flags;
 }