diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 69c55d4..95b9c8e 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1929,7 +1929,7 @@ 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;
 
 	/* We allocate both existing and potentially added groups */
 	flex_group_count = ((sbi->s_groups_count + groups_per_flex - 1) +