diff --git a/Makefile.am b/Makefile.am
index 1ac9033..359db2e 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,4 +24,4 @@
 	env.cpp \
 	fan_speed.cpp
 
-SUBDIRS = . test
+SUBDIRS = . test msl