diff --git a/t/002-upstream-tls.t b/t/002-upstream-tls.t
index 3abdec19..46d95cfc 100644
--- a/t/002-upstream-tls.t
+++ b/t/002-upstream-tls.t
@@ -543,7 +543,7 @@ GET /t
 .+502 Bad Gateway.+
 
 --- error_log
-upstream SSL certificate verify error: (22:certificate chain too long)
+upstream SSL certificate verify error: (20:unable to get issuer certificate)
 
 --- error_code: 502
 --- no_error_log
diff --git a/t/stream/001-upstream-tls.t b/t/stream/001-upstream-tls.t
index 93475293..04597d99 100644
--- a/t/stream/001-upstream-tls.t
+++ b/t/stream/001-upstream-tls.t
@@ -555,7 +555,7 @@ upstream SSL certificate verify error: (20:unable to get local issuer certificat
 receive stream response error: connection reset by peer
 
 --- error_log
-upstream SSL certificate verify error: (22:certificate chain too long)
+upstream SSL certificate verify error: (20:unable to get issuer certificate)
 
 --- skip_nginx
 3: < 1.21.4