diff --git a/tests/fsm/fsm_dealloc_test.c b/tests/fsm/fsm_dealloc_test.c
index 9a6974d..48f80e5 100644
--- a/tests/fsm/fsm_dealloc_test.c
+++ b/tests/fsm/fsm_dealloc_test.c
@@ -452,7 +452,7 @@
 
 	log_set_category_filter(osmo_stderr_target, DLGLOBAL, 1, LOGL_DEBUG);
 
-	osmo_fsm_register(&test_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&test_fsm) == 0);
 
 	test_osmo_fsm_term_safely();
 	test_osmo_fsm_set_dealloc_ctx();
diff --git a/tests/fsm/fsm_test.c b/tests/fsm/fsm_test.c
index f8ebdc7..911aad8 100644
--- a/tests/fsm/fsm_test.c
+++ b/tests/fsm/fsm_test.c
@@ -417,7 +417,7 @@
 
 	g_ctx = NULL;
 	OSMO_ASSERT(osmo_fsm_find_by_name(fsm.name) == NULL);
-	osmo_fsm_register(&fsm);
+	OSMO_ASSERT(osmo_fsm_register(&fsm) == 0);
 	OSMO_ASSERT(osmo_fsm_find_by_name(fsm.name) == &fsm);
 
 	OSMO_ASSERT(osmo_fsm_inst_find_by_name(&fsm, "my_id") == NULL);