diff --git a/src/sgsn/gprs_gmm_attach.c b/src/sgsn/gprs_gmm_attach.c
index 130f8d1..c903a01 100644
--- a/src/sgsn/gprs_gmm_attach.c
+++ b/src/sgsn/gprs_gmm_attach.c
@@ -449,7 +449,7 @@
 
 static __attribute__((constructor)) void gprs_gmm_fsm_init(void)
 {
-	osmo_fsm_register(&gmm_attach_req_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&gmm_attach_req_fsm) == 0);
 }
 
 void gmm_att_req_free(struct sgsn_mm_ctx *mm) {
diff --git a/src/sgsn/gprs_gmm_fsm.c b/src/sgsn/gprs_gmm_fsm.c
index fac06f2..94ecb50 100644
--- a/src/sgsn/gprs_gmm_fsm.c
+++ b/src/sgsn/gprs_gmm_fsm.c
@@ -183,5 +183,5 @@
 
 static __attribute__((constructor)) void gmm_fsm_init(void)
 {
-	osmo_fsm_register(&gmm_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&gmm_fsm) == 0);
 }
diff --git a/src/sgsn/gprs_mm_state_gb_fsm.c b/src/sgsn/gprs_mm_state_gb_fsm.c
index f6d680c..811f0c2 100644
--- a/src/sgsn/gprs_mm_state_gb_fsm.c
+++ b/src/sgsn/gprs_mm_state_gb_fsm.c
@@ -125,5 +125,5 @@
 
 static __attribute__((constructor)) void mm_state_gb_fsm_init(void)
 {
-	osmo_fsm_register(&mm_state_gb_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&mm_state_gb_fsm) == 0);
 }
diff --git a/src/sgsn/gprs_mm_state_iu_fsm.c b/src/sgsn/gprs_mm_state_iu_fsm.c
index ea31941..e571026 100644
--- a/src/sgsn/gprs_mm_state_iu_fsm.c
+++ b/src/sgsn/gprs_mm_state_iu_fsm.c
@@ -146,5 +146,5 @@
 
 static __attribute__((constructor)) void mm_state_iu_fsm_init(void)
 {
-	osmo_fsm_register(&mm_state_iu_fsm);
+	OSMO_ASSERT(osmo_fsm_register(&mm_state_iu_fsm) == 0);
 }