diff --git a/common/payload.cpp b/common/payload.cpp
index 86a805f..9d2fe46 100644
--- a/common/payload.cpp
+++ b/common/payload.cpp
@@ -215,7 +215,7 @@ bool PayloadProtocol::setFieldData(int index, const QVariant &value,
 
 bool PayloadProtocol::isProtocolFrameValueVariable() const
 {
-    return (AbstractProtocol::isProtocolFrameSizeVariable()
+    return (AbstractProtocol::isProtocolFrameValueVariable()
                ||  isProtocolFrameSizeVariable());
 }