diff --git a/test/Makefile.am.include b/test/Makefile.am.include
index feb1c97..71fa851 100644
--- a/test/Makefile.am.include
+++ b/test/Makefile.am.include
@@ -24,7 +24,8 @@
 	lpc.c \
 	lpc_reset.c \
 	common.c \
-	flash.c
+	flash.c \
+	protocol.c
 
 TEST_MOCK_SRCS = %reldir%/tmpf.c %reldir%/mbox.c %reldir%/system.c
 
diff --git a/test/mbox.c b/test/mbox.c
index dbf2526..a622d6e 100644
--- a/test/mbox.c
+++ b/test/mbox.c
@@ -231,6 +231,9 @@
 	test.context.windows.num = n_windows;
 	test.context.windows.default_size = len;
 
+	rc = protocol_init(&test.context);
+	assert(rc == 0);
+
 	/*
 	 * We need to call __init_mbox_dev() to initialise the handler table.
 	 * However, afterwards we need to discard the fd of the clearly useless