diff --git a/include/osmocom/gsm/Makefile.am b/include/osmocom/gsm/Makefile.am
index a39d2d0..c3670ec 100644
--- a/include/osmocom/gsm/Makefile.am
+++ b/include/osmocom/gsm/Makefile.am
@@ -1,5 +1,5 @@
 osmogsm_HEADERS = a5.h comp128.h gsm0808.h gsm48_ie.h mncc.h rxlev_stat.h \
-		  gsm0480.h gsm48.h gsm_utils.h rsl.h tlv.h
+		  gsm0480.h gsm48.h gsm_utils.h rsl.h tlv.h abis_nm.h
 
 SUBDIRS = protocol