diff --git a/lib/northbound.c b/lib/northbound.c
index ccfc3840ec..6a014f37ba 100644
--- a/lib/northbound.c
+++ b/lib/northbound.c
@@ -731,7 +731,13 @@ int nb_candidate_edit(struct nb_config *candidate,
 	case NB_OP_MOVE:
 		/* TODO: update configuration. */
 		break;
-	default:
+	case NB_OP_PRE_VALIDATE:
+	case NB_OP_APPLY_FINISH:
+	case NB_OP_GET_ELEM:
+	case NB_OP_GET_NEXT:
+	case NB_OP_GET_KEYS:
+	case NB_OP_LOOKUP_ENTRY:
+	case NB_OP_RPC:
 		flog_warn(EC_LIB_DEVELOPMENT,
 			  "%s: unknown operation (%u) [xpath %s]", __func__,
 			  operation, xpath_edit);
@@ -1360,7 +1366,13 @@ static int nb_callback_configuration(struct nb_context *context,
 		ret = nb_callback_move(context, nb_node, event, dnode, errmsg,
 				       errmsg_len);
 		break;
-	default:
+	case NB_OP_PRE_VALIDATE:
+	case NB_OP_APPLY_FINISH:
+	case NB_OP_GET_ELEM:
+	case NB_OP_GET_NEXT:
+	case NB_OP_GET_KEYS:
+	case NB_OP_LOOKUP_ENTRY:
+	case NB_OP_RPC:
 		yang_dnode_get_path(dnode, xpath, sizeof(xpath));
 		flog_err(EC_LIB_DEVELOPMENT,
 			 "%s: unknown operation (%u) [xpath %s]", __func__,
@@ -1489,7 +1501,7 @@ static int nb_transaction_process(enum nb_event event,
 			 * 'prepare' phase.
 			 */
 			break;
-		default:
+		case NB_EV_VALIDATE:
 			break;
 		}
 	}
@@ -2319,9 +2331,9 @@ const char *nb_event_name(enum nb_event event)
 		return "abort";
 	case NB_EV_APPLY:
 		return "apply";
-	default:
-		return "unknown";
 	}
+
+	assert(!"Reached end of function we should never hit");
 }
 
 const char *nb_operation_name(enum nb_operation operation)
@@ -2349,9 +2361,9 @@ const char *nb_operation_name(enum nb_operation operation)
 		return "lookup_entry";
 	case NB_OP_RPC:
 		return "rpc";
-	default:
-		return "unknown";
 	}
+
+	assert(!"Reached end of function we should never hit");
 }
 
 const char *nb_err_name(enum nb_error error)
@@ -2373,9 +2385,9 @@ const char *nb_err_name(enum nb_error error)
 		return "failed to allocate resource";
 	case NB_ERR_INCONSISTENCY:
 		return "internal inconsistency";
-	default:
-		return "unknown";
 	}
+
+	assert(!"Reached end of function we should never hit");
 }
 
 const char *nb_client_name(enum nb_client client)
@@ -2389,9 +2401,13 @@ const char *nb_client_name(enum nb_client client)
 		return "Sysrepo";
 	case NB_CLIENT_GRPC:
 		return "gRPC";
-	default:
-		return "unknown";
+	case NB_CLIENT_PCEP:
+		return "Pcep";
+	case NB_CLIENT_NONE:
+		return "None";
 	}
+
+	assert(!"Reached end of function we should never hit");
 }
 
 static void nb_load_callbacks(const struct frr_yang_module_info *module)