diff --git a/src/devwaveformStream.c b/src/devwaveformStream.c
index b6fadae..660756f 100644
--- a/src/devwaveformStream.c
+++ b/src/devwaveformStream.c
@@ -192,6 +192,7 @@ static long writeData (dbCommon *record, format_t *format)
                     return ERROR;
                 break;
             }
+            case DBF_ULONG:
             case DBF_LONG:
             case DBF_ENUM:
             {