diff --git a/src/lib/base/String.cpp b/src/lib/base/String.cpp
index d93785aa6..3c8808513 100644
--- a/src/lib/base/String.cpp
+++ b/src/lib/base/String.cpp
@@ -12,7 +12,6 @@
 #include <cstdarg>
 #include <cstdint>
 #include <cstring>
-#include <sstream>
 #include <vector>
 
 namespace deskflow::string {
@@ -140,14 +139,6 @@ std::string sprintf(const char *fmt, ...)
   return result;
 }
 
-size_t stringToSizeType(const std::string &string)
-{
-  std::istringstream iss(string);
-  size_t value;
-  iss >> value;
-  return value;
-}
-
 //
 // CaselessCmp
 //
diff --git a/src/lib/base/String.h b/src/lib/base/String.h
index d5a9af93f..ab1b20089 100644
--- a/src/lib/base/String.h
+++ b/src/lib/base/String.h
@@ -40,12 +40,6 @@ Equivalent to sprintf() except the result is returned as a String.
 */
 std::string sprintf(const char *fmt, ...);
 
-//! Convert a string to a size type
-/*!
-Convert an a \c string to an size type
-*/
-size_t stringToSizeType(const std::string &string);
-
 //! Case-insensitive comparisons
 /*!
 This class provides case-insensitve comparison functions.
diff --git a/src/lib/deskflow/ClipboardChunk.cpp b/src/lib/deskflow/ClipboardChunk.cpp
index 613fd2728..6e8fee23f 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 = deskflow::string::stringToSizeType(data);
+    s_expectedSize = QString::fromStdString(data).size();
     LOG_DEBUG("start receiving clipboard data");
     dataCached.clear();
     return Started;
diff --git a/src/unittests/base/StringTests.cpp b/src/unittests/base/StringTests.cpp
index 7273d8de1..93e0264f5 100644
--- a/src/unittests/base/StringTests.cpp
+++ b/src/unittests/base/StringTests.cpp
@@ -9,8 +9,6 @@
 
 #include "base/String.h"
 
-#include <string.h>
-
 void StringTests::formatWithArgs()
 {
   const char *format = "%%%{1}=%{2}";
@@ -33,11 +31,4 @@ void StringTests::formatedString()
   QCOMPARE("answer=42", result);
 }
 
-void StringTests::stringToInt()
-{
-  std::string number = "123";
-  size_t value = deskflow::string::stringToSizeType(number);
-  QCOMPARE(value, 123);
-}
-
 QTEST_MAIN(StringTests)
diff --git a/src/unittests/base/StringTests.h b/src/unittests/base/StringTests.h
index 7b37e6ceb..da8889947 100644
--- a/src/unittests/base/StringTests.h
+++ b/src/unittests/base/StringTests.h
@@ -12,5 +12,4 @@ class StringTests : public QObject
 private Q_SLOTS:
   void formatWithArgs();
   void formatedString();
-  void stringToInt();
 };