diff --git a/doc/Changelog b/doc/Changelog
index 8255021ca..20871bf13 100644
--- a/doc/Changelog
+++ b/doc/Changelog
@@ -2,6 +2,7 @@
 	- Fix that tcp for auth zone and outgoing does not remove and
 	  then gets the ssl read again applied to the deleted commpoint.
 	- updated contrib/fastrpz.patch to cleanly diff.
+	- no lock when threads disabled in tcp request buffer count.
 
 24 January 2018: Wouter
 	- Newer aclocal and libtoolize used for generating configure scripts,
diff --git a/services/listen_dnsport.c b/services/listen_dnsport.c
index ef65aeda1..f86a83d96 100644
--- a/services/listen_dnsport.c
+++ b/services/listen_dnsport.c
@@ -76,8 +76,10 @@
 /** number of simultaneous requests a client can have */
 #define TCP_MAX_REQ_SIMULTANEOUS 32
 
+#ifndef THREADS_DISABLED
 /** lock on the counter of stream buffer memory */
 static lock_basic_type stream_wait_count_lock;
+#endif
 /** size (in bytes) of stream wait buffers */
 static size_t stream_wait_count = 0;
 /** is the lock initialised for stream wait buffers */