diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 3cec2fb4fdc1..72068ce50d76 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -185,7 +185,6 @@ static const char * const logtypes[] = {
 
 void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
 {
-	struct super_block *sb = fs_info->sb;
 	char lvl[4];
 	struct va_format vaf;
 	va_list args;
@@ -207,7 +206,8 @@ void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
 	vaf.fmt = fmt;
 	vaf.va = &args;
 
-	printk("%sBTRFS %s (device %s): %pV\n", lvl, type, sb->s_id, &vaf);
+	printk("%sBTRFS %s (device %s): %pV\n", lvl, type,
+		fs_info ? fs_info->sb->s_id : "<unknown>", &vaf);
 
 	va_end(args);
 }