diff --git a/doc/Changelog b/doc/Changelog
index 3c859dd47..d90bda71f 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -1,3 +1,6 @@
+22 January 2018: Wouter
+	- Fix space calculation for tcp req buffer size.
+
 21 January 2018: Wouter
 	- Fix tcp idle timeout test, for difference in the tcp reply code.
 	- Unit test for tcp request reorder and timeouts.
diff --git a/services/listen_dnsport.c b/services/listen_dnsport.c
index c1d1c655e..ef65aeda1 100644
--- a/services/listen_dnsport.c
+++ b/services/listen_dnsport.c
@@ -1821,7 +1821,7 @@ tcp_req_info_add_result(struct tcp_req_info* req, uint8_t* buf, size_t len)
 		verbose(VERB_ALGO, "drop stream reply, no space left, in stream-wait-size");
 		return 0;
 	}
-	stream_wait_count += stream_wait_max;
+	stream_wait_count += space;
 	lock_basic_unlock(&stream_wait_count_lock);
 
 	/* find last element */