diff --git a/openbsc/configure.ac b/openbsc/configure.ac
index 00d1b70..394972f 100644
--- a/openbsc/configure.ac
+++ b/openbsc/configure.ac
@@ -179,6 +179,7 @@
     src/libmsc/Makefile
     src/libmgcp/Makefile
     src/libcommon/Makefile
+    src/libfilter/Makefile
     src/osmo-nitb/Makefile
     src/osmo-bsc/Makefile
     src/osmo-bsc_nat/Makefile