diff --git a/include/linux/netfilter/xt_comment.h b/include/linux/netfilter/xt_comment.h
index eacfedc6b5d07e3899ca8ad88f66ccc0f817cff3..0ea5e79f5bd73fade99d020a96b68c55a8c32224 100644
--- a/include/linux/netfilter/xt_comment.h
+++ b/include/linux/netfilter/xt_comment.h
@@ -4,7 +4,7 @@
 #define XT_MAX_COMMENT_LEN 256
 
 struct xt_comment_info {
-	unsigned char comment[XT_MAX_COMMENT_LEN];
+	char comment[XT_MAX_COMMENT_LEN];
 };
 
 #endif /* XT_COMMENT_H */