diff --git a/pointer_input.cpp b/pointer_input.cpp
--- a/pointer_input.cpp
+++ b/pointer_input.cpp
@@ -59,52 +59,38 @@
 namespace KWin
 {
 
+static const QHash<uint32_t, Qt::MouseButton> s_buttonToQtMouseButton = {
+    { BTN_LEFT , Qt::LeftButton },
+    { BTN_MIDDLE , Qt::MiddleButton },
+    { BTN_RIGHT , Qt::RightButton },
+    // in QtWayland mapped like that
+    { BTN_SIDE , Qt::ExtraButton1 },
+    // in QtWayland mapped like that
+    { BTN_EXTRA , Qt::ExtraButton2 },
+    { BTN_BACK , Qt::BackButton },
+    { BTN_FORWARD , Qt::ForwardButton },
+    { BTN_TASK , Qt::TaskButton },
+    // mapped like that in QtWayland
+    { 0x118 , Qt::ExtraButton6 },
+    { 0x119 , Qt::ExtraButton7 },
+    { 0x11a , Qt::ExtraButton8 },
+    { 0x11b , Qt::ExtraButton9 },
+    { 0x11c , Qt::ExtraButton10 },
+    { 0x11d , Qt::ExtraButton11 },
+    { 0x11e , Qt::ExtraButton12 },
+    { 0x11f , Qt::ExtraButton13 },
+};
+
 static Qt::MouseButton buttonToQtMouseButton(uint32_t button)
 {
-    switch (button) {
-    case BTN_LEFT:
-        return Qt::LeftButton;
-    case BTN_MIDDLE:
-        return Qt::MiddleButton;
-    case BTN_RIGHT:
-        return Qt::RightButton;
-    case BTN_SIDE:
-        // in QtWayland mapped like that
-        return Qt::ExtraButton1;
-    case BTN_EXTRA:
-        // in QtWayland mapped like that
-        return Qt::ExtraButton2;
-    case BTN_BACK:
-        return Qt::BackButton;
-    case BTN_FORWARD:
-        return Qt::ForwardButton;
-    case BTN_TASK:
-        return Qt::TaskButton;
-        // mapped like that in QtWayland
-    case 0x118:
-        return Qt::ExtraButton6;
-    case 0x119:
-        return Qt::ExtraButton7;
-    case 0x11a:
-        return Qt::ExtraButton8;
-    case 0x11b:
-        return Qt::ExtraButton9;
-    case 0x11c:
-        return Qt::ExtraButton10;
-    case 0x11d:
-        return Qt::ExtraButton11;
-    case 0x11e:
-        return Qt::ExtraButton12;
-    case 0x11f:
-        return Qt::ExtraButton13;
-    }
     // all other values get mapped to ExtraButton24
     // this is actually incorrect but doesn't matter in our usage
     // KWin internally doesn't use these high extra buttons anyway
     // it's only needed for recognizing whether buttons are pressed
     // if multiple buttons are mapped to the value the evaluation whether
     // buttons are pressed is correct and that's all we care about.
-    return Qt::ExtraButton24;
+    return s_buttonToQtMouseButton.value(button, Qt::ExtraButton24);
+}
 }
 
 static bool screenContainsPos(const QPointF &pos)