diff --git a/src/EditProfileDialog.h b/src/EditProfileDialog.h
--- a/src/EditProfileDialog.h
+++ b/src/EditProfileDialog.h
@@ -44,11 +44,6 @@
 #include "KeyboardTranslatorManager.h"
 #include "FontDialog.h"
 
-// Backward compatibility
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
-#define qAsConst(code)
-#endif
-
 class KPluralHandlingSpinBox;
 class KLocalizedString;
 class QItemSelectionModel;
diff --git a/src/ScrollState.cpp b/src/ScrollState.cpp
--- a/src/ScrollState.cpp
+++ b/src/ScrollState.cpp
@@ -25,21 +25,10 @@
 
 void ScrollState::addWheelEvent(const QWheelEvent *wheel)
 {
-    // If the Libinput X server input driver is used we get a value for
-    // pixelDelta for a physical mouse wheel scroll, so we check that
-    // the source of the wheel event is actually a mouse, this has been
-    // fixed upstream in Qt 5.9.5: https://bugreports.qt.io/browse/QTBUG-59261
-    // Fixes Konsole BUG: https://bugs.kde.org/show_bug.cgi?id=386762
-#if (QT_VERSION < QT_VERSION_CHECK(5, 9, 5))
-    if (wheel->source() != Qt::MouseEventNotSynthesized) {
-#else
-    if (true) {
-#endif
-        if ((wheel->angleDelta().y() != 0) && (wheel->pixelDelta().y() == 0)) {
-            _remainingScrollPixel = 0;
-        } else {
-            _remainingScrollPixel += wheel->pixelDelta().y();
-        }
+    if ((wheel->angleDelta().y() != 0) && (wheel->pixelDelta().y() == 0)) {
+        _remainingScrollPixel = 0;
+    } else {
+        _remainingScrollPixel += wheel->pixelDelta().y();
     }
     _remainingScrollAngle += wheel->angleDelta().y();
 }
diff --git a/src/TerminalDisplay.cpp b/src/TerminalDisplay.cpp
--- a/src/TerminalDisplay.cpp
+++ b/src/TerminalDisplay.cpp
@@ -715,9 +715,7 @@
             paint.drawLine(cx + xHalfGap, cy - 1, ex, cy - 1);
             paint.drawLine(cx + xHalfGap, cy + 1, ex, cy + 1);
             // No break!
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 8, 0))
             Q_FALLTHROUGH();
-#endif
         case 0x4C: // BOX DRAWINGS LIGHT DOUBLE DASH HORIZONTAL
             paint.drawLine(x, cy, cx - xHalfGap - 1, cy);
             paint.drawLine(cx + xHalfGap, cy, ex, cy);
@@ -728,9 +726,7 @@
             paint.drawLine(cx - 1, cy + yHalfGap, cx - 1, ey);
             paint.drawLine(cx + 1, cy + yHalfGap, cx + 1, ey);
             // No break!
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 8, 0))
             Q_FALLTHROUGH();
-#endif
         case 0x4E: // BOX DRAWINGS LIGHT DOUBLE DASH VERTICAL
             paint.drawLine(cx, y, cx, cy - yHalfGap - 1);
             paint.drawLine(cx, cy + yHalfGap, cx, ey);
diff --git a/tools/uni2characterwidth/template.h b/tools/uni2characterwidth/template.h
--- a/tools/uni2characterwidth/template.h
+++ b/tools/uni2characterwidth/template.h
@@ -26,11 +26,6 @@
 #include <QString>
 #include <QVector>
 
-// Backward compatibility
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0) && !defined(qAsConst)
-#define qAsConst(code) code
-#endif
-
 // QVariant doesn't offer modification in place. Var does.
 class Var {
 public:
diff --git a/tools/uni2characterwidth/uni2characterwidth.cpp b/tools/uni2characterwidth/uni2characterwidth.cpp
--- a/tools/uni2characterwidth/uni2characterwidth.cpp
+++ b/tools/uni2characterwidth/uni2characterwidth.cpp
@@ -36,11 +36,6 @@
 
 #include <KIO/Job>
 
-// Backward compatibility
-#if QT_VERSION < QT_VERSION_CHECK(5, 7, 0)
-#define qAsConst(code) code
-#endif
-
 
 
 static constexpr unsigned int CODE_POINTS_NUM = 0x110000;