diff --git a/pg_md5.c b/pg_md5.c
index c996bda..4693838 100644
--- a/pg_md5.c
+++ b/pg_md5.c
@@ -191,7 +191,7 @@ main(int argc, char *argv[])
 static void update_pool_passwd(char *conf_file, char *username, char *password)
 {
 	struct passwd *pw;
-	char	 md5[MD5_PASSWD_LEN+1];
+	char	 md5[POOL_PASSWD_LEN+1];
 	char pool_passwd[POOLMAXPATHLEN+1];
 	char dirnamebuf[POOLMAXPATHLEN+1];
 	char *dirp;