diff --git a/include/osmocom/abis/Makefile.am b/include/osmocom/abis/Makefile.am
index 3093ee5..6cf3510 100644
--- a/include/osmocom/abis/Makefile.am
+++ b/include/osmocom/abis/Makefile.am
@@ -1,3 +1,8 @@
-osmoabis_HEADERS = abis.h e1_input.h subchan_demux.h ipaccess.h trau_frame.h
+osmoabis_HEADERS = abis.h		\
+		   e1_input.h		\
+		   subchan_demux.h	\
+		   ipa_proxy.h		\
+		   ipaccess.h		\
+		   trau_frame.h
 
 osmoabisdir = $(includedir)/osmocom/gsm/abis