diff --git a/src/Makefile.am b/src/Makefile.am
index 27e0e19..00af272 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -3,7 +3,7 @@
 ASN1_ROOT = $(top_builddir)/asn1/
 ASN1TOSTRUCT = $(ASN1_ROOT)/utils/asn1tostruct.py
 
-AM_CFLAGS = $(OSMOCORE_CFLAGS) $(OSMOVTY_CFLAGS) $(OSMOGSM_CFLAGS) $(ASN1C_CFLAGS) $(OSMOSIGTRAN_CFLAGS) -Ihnbap/
+AM_CFLAGS = $(OSMOCORE_CFLAGS) $(OSMOVTY_CFLAGS) $(OSMOGSM_CFLAGS) $(OSMONETIF_CFLAGS) $(ASN1C_CFLAGS) $(OSMOSIGTRAN_CFLAGS) -Ihnbap/
 COMMON_LDADD = -lsctp
 
 bin_PROGRAMS = hnbgw