diff --git a/Makefile.am b/Makefile.am
index 9a31124..3a1b52b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -60,6 +60,7 @@
 	pid/zone.cpp \
 	pid/util.cpp \
 	pid/pidthread.cpp \
+	pid/tuning.cpp \
 	threads/busthread.cpp \
 	build/buildjson.cpp \
 	experiments/drive.cpp