diff --git a/ubi/Makefile.am.include b/ubi/Makefile.am.include
index b343a74..123f58d 100644
--- a/ubi/Makefile.am.include
+++ b/ubi/Makefile.am.include
@@ -3,7 +3,7 @@
 	%reldir%/item_updater_helper.cpp
 
 if HAVE_SYSTEMD
-systemdsystemunit_DATA = \
+systemdsystemunit_DATA += \
 	%reldir%/obmc-flash-bmc-cleanup.service \
 	%reldir%/obmc-flash-bmc-mirroruboot.service \
 	%reldir%/obmc-flash-bmc-ubiremount.service \