diff --git a/introspection/Makefile.am b/introspection/Makefile.am
index ce07e850..612311c6 100644
--- a/introspection/Makefile.am
+++ b/introspection/Makefile.am
@@ -1,4 +1,5 @@
 EXTRA_DIST = \
+	mm-gsm-modem-hso.xml \
 	mm-manager.xml \
 	mm-modem.xml \
 	mm-modem-cdma.xml \