diff --git a/src/lib/deskflow/ClipboardChunk.cpp b/src/lib/deskflow/ClipboardChunk.cpp
index 6e8fee23f..7abbdba1a 100644
--- a/src/lib/deskflow/ClipboardChunk.cpp
+++ b/src/lib/deskflow/ClipboardChunk.cpp
@@ -74,7 +74,7 @@ ClipboardChunk::assemble(deskflow::IStream *stream, std::string &dataCached, Cli
   }
 
   if (mark == ChunkType::DataStart) {
-    s_expectedSize = QString::fromStdString(data).size();
+    s_expectedSize = QString::fromStdString(data).toULong();
     LOG_DEBUG("start receiving clipboard data");
     dataCached.clear();
     return Started;