diff --git a/src/qt/bitcoin.cpp b/src/qt/bitcoin.cpp
--- a/src/qt/bitcoin.cpp
+++ b/src/qt/bitcoin.cpp
@@ -536,10 +536,8 @@
     Q_INIT_RESOURCE(bitcoin);
     Q_INIT_RESOURCE(bitcoin_locale);
 
-#if QT_VERSION > 0x050100
     // Generate high-dpi pixmaps
     QApplication::setAttribute(Qt::AA_UseHighDpiPixmaps);
-#endif
 #if QT_VERSION >= 0x050600
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
 #endif
diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -47,6 +47,7 @@
 #include <QDoubleValidator>
 #include <QFileDialog>
 #include <QFont>
+#include <QFontDatabase>
 #include <QKeyEvent>
 #include <QLineEdit>
 #include <QMouseEvent>
@@ -55,10 +56,6 @@
 #include <QThread>
 #include <QUrlQuery>
 
-#if QT_VERSION >= 0x50200
-#include <QFontDatabase>
-#endif
-
 #if defined(Q_OS_MAC)
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wdeprecated-declarations"
@@ -80,13 +77,7 @@
 }
 
 QFont fixedPitchFont() {
-#if QT_VERSION >= 0x50200
     return QFontDatabase::systemFont(QFontDatabase::FixedFont);
-#else
-    QFont font("Monospace");
-    font.setStyleHint(QFont::Monospace);
-    return font;
-#endif
 }
 
 static std::string MakeAddrInvalid(std::string addr,
diff --git a/src/qt/splashscreen.cpp b/src/qt/splashscreen.cpp
--- a/src/qt/splashscreen.cpp
+++ b/src/qt/splashscreen.cpp
@@ -38,11 +38,9 @@
 
     float fontFactor = 1.0;
     float devicePixelRatio = 1.0;
-#if QT_VERSION > 0x050100
     devicePixelRatio =
         static_cast<QGuiApplication *>(QCoreApplication::instance())
             ->devicePixelRatio();
-#endif
 
     // define text to place
     QString titleText = PACKAGE_NAME;
@@ -59,10 +57,8 @@
     QSize splashSize(634 * devicePixelRatio, 320 * devicePixelRatio);
     pixmap = QPixmap(splashSize);
 
-#if QT_VERSION > 0x050100
     // change to HiDPI if it makes sense
     pixmap.setDevicePixelRatio(devicePixelRatio);
-#endif
 
     QPainter pixPaint(&pixmap);
     pixPaint.setPen(QColor(100, 100, 100));