diff --git a/tests/Makefile.am b/tests/Makefile.am
index c7d16aa..9f52ae7 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,5 +1,5 @@
 if ENABLE_TESTS
-SUBDIRS = timer sms ussd smscb bits a5 conv
+SUBDIRS = timer sms ussd smscb bits a5 conv auth
 if ENABLE_MSGFILE
 SUBDIRS += msgfile
 endif