diff --git a/src/51d.c b/src/51d.c
index 421c0de..1f1a5f9 100644
--- a/src/51d.c
+++ b/src/51d.c
@@ -605,6 +605,9 @@
 		case DATA_SET_INIT_STATUS_NOT_SET:
 			chunk_printf(temp, "Data set not initialised.");
 			break;
+		default:
+			chunk_printf(temp, "Other error.");
+			break;
 	}
 	if (_51d_dataset_status != DATA_SET_INIT_STATUS_SUCCESS) {
 		if (temp->len)