diff --git a/opal/include/opal/sys/Makefile.am b/opal/include/opal/sys/Makefile.am
index c0ca73342f..c99af20279 100644
--- a/opal/include/opal/sys/Makefile.am
+++ b/opal/include/opal/sys/Makefile.am
@@ -27,6 +27,7 @@ headers += \
 
 include opal/sys/alpha/Makefile.am
 include opal/sys/amd64/Makefile.am
+include opal/sys/arm/Makefile.am
 include opal/sys/ia32/Makefile.am
 include opal/sys/ia64/Makefile.am
 include opal/sys/mips/Makefile.am