diff --git a/h2_request_body_preread.t b/h2_request_body_preread.t
index 8edbb4c..37d4eaa 100644
--- a/h2_request_body_preread.t
+++ b/h2_request_body_preread.t
@@ -37,7 +37,7 @@
 http {
     %%TEST_GLOBALS_HTTP%%
 
-    limit_req_zone   $binary_remote_addr  zone=req:1m rate=30r/m;
+    limit_req_zone   $binary_remote_addr  zone=req:1m rate=20r/m;
 
     server {
         listen       127.0.0.1:8080 http2;