diff --git a/CMakeLists.txt b/CMakeLists.txt
index 64fbaabb1..7ca08cf2b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -120,7 +120,7 @@ if(WIN32)
 endif(WIN32)
 
 # QT
-set(QT_MIN_VERSION 5.6)
+set(QT_MIN_VERSION 5.5)
 find_package(Qt5 ${QT_MIN_VERSION} REQUIRED COMPONENTS Core Concurrent Widgets Network Sql)
 if(X11_FOUND)
   find_package(Qt5 ${QT_MIN_VERSION} REQUIRED COMPONENTS X11Extras)
diff --git a/src/widgets/stretchheaderview.cpp b/src/widgets/stretchheaderview.cpp
index 37cdd0995..78113b946 100644
--- a/src/widgets/stretchheaderview.cpp
+++ b/src/widgets/stretchheaderview.cpp
@@ -247,7 +247,11 @@ bool StretchHeaderView::RestoreState(const QByteArray& data) {
 
   QDataStream s(data);
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 6, 0)
+  s.setVersion(QDataStream::Qt_5_5);
+#else
   s.setVersion(QDataStream::Qt_5_6);
+#endif
 
   int magic_number = 0;
   s >> magic_number;
@@ -311,7 +315,11 @@ QByteArray StretchHeaderView::SaveState() const {
     visual_indices << logicalIndex(i);
   }
 
+#if QT_VERSION < QT_VERSION_CHECK(5, 6, 0)
+  s.setVersion(QDataStream::Qt_5_5);
+#else
   s.setVersion(QDataStream::Qt_5_6);
+#endif
 
   s << kMagicNumber;