diff --git a/Makefile b/Makefile
index 0d3038d9..cc2d244b 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ SUBDIRS = inst/pre \
 		lock sigsync shmem \
 		usrv uclnt statecheck msgfmt \
 		YMisc YError YMem \
-		YThread YMutex YEvent YCbContr contr/Y2WayMap contr/YQueue \
+		YThread YMutex YEvent YCbContr contr/Y2WayMap contr/YQueue contr/YRingBuffer \
 		YTimeB YStopWatch YStopWatchList YStopWatchQueue YStopWatchThreadList \
 		YOsc \
 		lib include bin \