diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index 56d2b31..798710b 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -4490,7 +4490,7 @@
 	chk->index = 2;
 	LIST_APPEND(&rs->rules, &chk->list);
 
-	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rbinary", "^52000000(08|0A|0C)000000(00|02|03|04|05|06)",
+	chk = parse_tcpcheck_expect((char *[]){"tcp-check", "expect", "rbinary", "^52000000[A-Z0-9]{2}000000(00|02|03|04|05|06|07|09|0A)",
 				               "min-recv", "9",
 				               "error-status", "L7STS",
 				               "on-success", "PostgreSQL server is ok",