diff --git a/geometry.cpp b/geometry.cpp
--- a/geometry.cpp
+++ b/geometry.cpp
@@ -1141,14 +1141,9 @@
     // Old and new maximums have different starting values so windows on the screen
     // edge will move when a new strut is placed on the edge.
     QRect oldScreenArea;
-    QRect oldGeomTall;
-    QRect oldGeomWide;
-    const auto displaySize = screens()->displaySize();
     if( workspace()->inUpdateClientArea()) {
         // we need to find the screen area as it was before the change
         oldScreenArea = QRect( 0, 0, workspace()->oldDisplayWidth(), workspace()->oldDisplayHeight());
-        oldGeomTall = QRect(oldGeometry.x(), 0, oldGeometry.width(), workspace()->oldDisplayHeight());   // Full screen height
-        oldGeomWide = QRect(0, oldGeometry.y(), workspace()->oldDisplayWidth(), oldGeometry.height());   // Full screen width
         int distance = INT_MAX;
         foreach(const QRect &r, workspace()->previousScreenSizes()) {
             int d = r.contains( oldGeometry.center()) ? 0 : ( r.center() - oldGeometry.center()).manhattanLength();
@@ -1159,9 +1154,9 @@
         }
     } else {
         oldScreenArea = workspace()->clientArea(ScreenArea, oldGeometry.center(), oldDesktop);
-        oldGeomTall = QRect(oldGeometry.x(), 0, oldGeometry.width(), displaySize.height());   // Full screen height
-        oldGeomWide = QRect(0, oldGeometry.y(), displaySize.width(), oldGeometry.height());   // Full screen width
     }
+    const QRect oldGeomTall = QRect(oldGeometry.x(), oldScreenArea.y(), oldGeometry.width(), oldScreenArea.height());   // Full screen height
+    const QRect oldGeomWide = QRect(oldScreenArea.x(), oldGeometry.y(), oldScreenArea.width(), oldGeometry.height());   // Full screen width
     int oldTopMax = oldScreenArea.y();
     int oldRightMax = oldScreenArea.x() + oldScreenArea.width();
     int oldBottomMax = oldScreenArea.y() + oldScreenArea.height();
@@ -1173,8 +1168,8 @@
     int leftMax = screenArea.x();
     QRect newGeom = geometryRestore(); // geometry();
     QRect newClientGeom = newGeom.adjusted(border[Left], border[Top], -border[Right], -border[Bottom]);
-    const QRect newGeomTall = QRect(newGeom.x(), 0, newGeom.width(), displaySize.height());   // Full screen height
-    const QRect newGeomWide = QRect(0, newGeom.y(), displaySize.width(), newGeom.height());   // Full screen width
+    const QRect newGeomTall = QRect(newGeom.x(), screenArea.y(), newGeom.width(), screenArea.height());   // Full screen height
+    const QRect newGeomWide = QRect(screenArea.x(), newGeom.y(), screenArea.width(), newGeom.height());   // Full screen width
     // Get the max strut point for each side where the window is (E.g. Highest point for
     // the bottom struts bounded by the window's left and right sides).