diff --git a/Makefile.am b/Makefile.am
index 2efbe77..378c565 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -67,6 +67,7 @@
 	hwmon.cpp \
 	hwmonio.cpp \
 	sensor.cpp \
-	gpio_handle.cpp
+	gpio_handle.cpp \
+	average.cpp
 
 SUBDIRS = . msl test tools