diff --git a/src/bankd_client_fsm.c b/src/bankd_client_fsm.c
index cedb597..2e3fdc9 100644
--- a/src/bankd_client_fsm.c
+++ b/src/bankd_client_fsm.c
@@ -271,5 +271,5 @@
 
 static __attribute__((constructor)) void on_dso_load(void)
 {
-	osmo_fsm_register(&remsim_client_bankd_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&remsim_client_bankd_fsm) == 0);
 }
diff --git a/src/rspro_client_fsm.c b/src/rspro_client_fsm.c
index 45cd08e..c01a763 100644
--- a/src/rspro_client_fsm.c
+++ b/src/rspro_client_fsm.c
@@ -382,5 +382,5 @@
 
 static __attribute__((constructor)) void on_dso_load(void)
 {
-	osmo_fsm_register(&rspro_client_server_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&rspro_client_server_fsm) == 0);
 }
diff --git a/src/server/rspro_server.c b/src/server/rspro_server.c
index c753f16..0d059fa 100644
--- a/src/server/rspro_server.c
+++ b/src/server/rspro_server.c
@@ -491,7 +491,7 @@
 
 static __attribute__((constructor)) void on_dso_load(void)
 {
-	osmo_fsm_register(&remsim_server_client_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&remsim_server_client_fsm) == 0);
 }