diff --git a/test/eierpecken.c b/test/eierpecken.c
index 6578af8..884b381 100644
--- a/test/eierpecken.c
+++ b/test/eierpecken.c
@@ -85,6 +85,7 @@ peck_new(void)
 	rc = eis_setup_backend_fd(eis);
 	munit_assert_int(rc, ==, 0);
 	rc = eis_backend_fd_add_fd(eis, sv[1]);
+	munit_assert_int(rc, ==, 0);
 	peck->eis = eis;
 	peck->eis_behavior = PECK_EIS_BEHAVIOR_NONE;