diff --git a/openbsc/tests/Makefile.am b/openbsc/tests/Makefile.am
index 84dbd92..cede8e8 100644
--- a/openbsc/tests/Makefile.am
+++ b/openbsc/tests/Makefile.am
@@ -1,4 +1,4 @@
-SUBDIRS = gsm0408 db channel mgcp gprs
+SUBDIRS = gsm0408 db channel mgcp gprs si
 
 if BUILD_NAT
 SUBDIRS += bsc-nat