diff --git a/src/libvlr/vlr_lu_fsm.c b/src/libvlr/vlr_lu_fsm.c
index 27196d8..15ab88c 100644
--- a/src/libvlr/vlr_lu_fsm.c
+++ b/src/libvlr/vlr_lu_fsm.c
@@ -1086,8 +1086,7 @@
 		_start_lu_main(fi);
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }
@@ -1104,8 +1103,7 @@
 		vlr_loc_upd_want_imsi(fi);
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }
@@ -1170,8 +1168,7 @@
 		vlr_loc_upd_node1(fi);
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }
@@ -1213,8 +1210,7 @@
 		}
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }
@@ -1264,8 +1260,7 @@
 		lu_fsm_failure(fi, cause);
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }
@@ -1297,8 +1292,7 @@
 		lu_fsm_failure(fi, cause);
 		break;
 	default:
-		LOGPFSML(fi, LOGL_ERROR, "event without effect: %s\n",
-			 osmo_fsm_event_name(fi->fsm, event));
+		OSMO_ASSERT(0);
 		break;
 	}
 }