diff --git a/libs/openzap/src/Makefile b/libs/openzap/src/Makefile
index cd2040f9c5..1703dfd9df 100644
--- a/libs/openzap/src/Makefile
+++ b/libs/openzap/src/Makefile
@@ -51,7 +51,10 @@ isdn/Q931ie.o \
 isdn/Q931mes.o \
 isdn/Q931StateNT.o \
 isdn/Q931StateTE.o \
-isdn/nationalStateNT.o\
+isdn/nationalie.o \
+isdn/nationalmes.o \
+isdn/nationalStateNT.o \
+isdn/nationalStateTE.o \
 isdn/Q932mes.o 
 
 PWD=$(shell pwd)