diff --git a/tests/e1inp_ipa_bts_test.c b/tests/e1inp_ipa_bts_test.c
index bf46e9e..1b9a2db 100644
--- a/tests/e1inp_ipa_bts_test.c
+++ b/tests/e1inp_ipa_bts_test.c
@@ -205,9 +205,14 @@
 
 static int test_bts_gsm_12_21_cb(struct osmo_fd *ofd, unsigned int what)
 {
-	int ret;
+	int ret, event_type;
 	struct ipaccess_unit *unit = ofd->data;
 
+	if (read(eventfds[0], &event_type, sizeof(unsigned int)) < 0) {
+		LOGP(DBTSTEST, LOGL_ERROR, "error receiving event\n");
+		return 0;
+	}
+
 	switch(bts_state) {
 	case BTS_TEST_OML_SIGN_LINK_DOWN:
 		/* Do nothing until OML link becomes ready. */