diff --git a/src/fastcgi.c b/src/fastcgi.c
index c7e96a4..cb04243 100644
--- a/src/fastcgi.c
+++ b/src/fastcgi.c
@@ -423,6 +423,7 @@ int fastcgi_send(fastcgi_conn *conn, sock *client, int flags) {
 
             if (flags & FASTCGI_COMPRESS) {
                 finish_comp = 1;
+                content_len = 0;
                 goto out;
                 finish:
                 deflateEnd(&strm);