diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 8c45bb701..a73d89e81 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -36,6 +36,7 @@ include_directories(${CMAKE_CURRENT_SOURCE_DIR})
 # defines
 add_definitions(-DQT_DEPRECATED_WARNINGS)
 add_definitions(-DQT_NO_CAST_TO_ASCII)
+add_definitions(-DQT_NO_CAST_FROM_BYTEARRAY)
 add_definitions(-DQT_USE_QSTRINGBUILDER)
 add_definitions(-DQT_STRICT_ITERATORS)
 
diff --git a/src/base/http/requestparser.cpp b/src/base/http/requestparser.cpp
index e6e1853f6..3f74b7a76 100644
--- a/src/base/http/requestparser.cpp
+++ b/src/base/http/requestparser.cpp
@@ -202,7 +202,7 @@ bool RequestParser::parseRequestLine(const QString &line)
             const QByteArray valueComponent = midView(param, (eqCharPos + 1));
             const QString paramName = QString::fromUtf8(QByteArray::fromPercentEncoding(nameComponent).replace('+', ' '));
             const QByteArray paramValue = valueComponent.isNull()
-                ? ""
+                ? QByteArray("")
                 : QByteArray::fromPercentEncoding(valueComponent).replace('+', ' ');
 
             m_request.query[paramName] = paramValue;
diff --git a/src/src.pro b/src/src.pro
index bf64d2860..5ad945bfe 100644
--- a/src/src.pro
+++ b/src/src.pro
@@ -57,6 +57,7 @@ include(../version.pri)
 # Qt defines
 DEFINES += QT_DEPRECATED_WARNINGS
 DEFINES += QT_NO_CAST_TO_ASCII
+DEFINES += QT_NO_CAST_FROM_BYTEARRAY
 DEFINES += QT_USE_QSTRINGBUILDER
 DEFINES += QT_STRICT_ITERATORS