diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index 6daf6ce..4263ea1 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -1144,7 +1144,7 @@
             return NGX_OK;
         }
 
-        if (u->buffer.pos == u->buffer.last) {
+        if (rc == NGX_OK && u->buffer.pos == u->buffer.last) {
             return NGX_AGAIN;
         }