diff --git a/monitor/Makefile.am b/monitor/Makefile.am
index ceec3dd..26b66b5 100644
--- a/monitor/Makefile.am
+++ b/monitor/Makefile.am
@@ -5,8 +5,10 @@
 	phosphor-fan-monitor
 
 phosphor_fan_monitor_SOURCES = \
+	fan.cpp \
 	generated.cpp \
-	main.cpp
+	main.cpp \
+	tach_sensor.cpp
 
 phosphor_fan_monitor_LDADD = \
 	$(SDBUSPLUS_LIBS) \