diff --git a/openbsc/tests/Makefile.am b/openbsc/tests/Makefile.am
index c9afeed..0597c14 100644
--- a/openbsc/tests/Makefile.am
+++ b/openbsc/tests/Makefile.am
@@ -1,7 +1,7 @@
 SUBDIRS = gsm0408 db channel mgcp gprs si abis
 
 if BUILD_NAT
-SUBDIRS += bsc-nat
+SUBDIRS += bsc-nat bsc-nat-trie
 endif
 
 if BUILD_SMPP