diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 5ededf135335ea804fb2efea55b60b865ba53769..8ab650b1aa1e3e4cd896ede357e92eb05fbffa8e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1970,7 +1970,7 @@ static int ext4_fill_flex_info(struct super_block *sb)
 		sbi->s_log_groups_per_flex = 0;
 		return 1;
 	}
-	groups_per_flex = 1 << sbi->s_log_groups_per_flex;
+	groups_per_flex = 1U << sbi->s_log_groups_per_flex;
 
 	err = ext4_alloc_flex_bg_array(sb, sbi->s_groups_count);
 	if (err)