diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 92d7a07..86dab55 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -138,6 +138,7 @@
     tests/bsc-nat/Makefile
     tests/mgcp/Makefile
     tests/gprs/Makefile
+    tests/si/Makefile
     doc/Makefile
     doc/examples/Makefile
     Makefile)