diff --git a/lib/ts_kmp.c b/lib/ts_kmp.c
index 94617e014b3a..c77a3d537f24 100644
--- a/lib/ts_kmp.c
+++ b/lib/ts_kmp.c
@@ -36,7 +36,7 @@ struct ts_kmp
 {
 	u8 *		pattern;
 	unsigned int	pattern_len;
-	unsigned int 	prefix_tbl[0];
+	unsigned int	prefix_tbl[];
 };
 
 static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)