diff --git a/src/widgets/styles/qfusionstyle.cpp b/src/widgets/styles/qfusionstyle.cpp
index 554c45d570..6873ca876e 100644
--- a/src/widgets/styles/qfusionstyle.cpp
+++ b/src/widgets/styles/qfusionstyle.cpp
@@ -763,7 +763,7 @@ void QFusionStyle::drawPrimitive(PrimitiveElement elem,
             painter->drawRect(rect);
 
             QColor checkMarkColor = option->palette.text().color().darker(120);
-            const int checkMarkPadding = 1 + rect.width() * 0.2; // at least one pixel padding
+            const qreal checkMarkPadding = 1 + rect.width() * 0.13; // at least one pixel padding
 
             if (checkbox->state & State_NoChange) {
                 gradient = QLinearGradient(rect.topLeft(), rect.bottomLeft());
@@ -775,20 +775,23 @@ void QFusionStyle::drawPrimitive(PrimitiveElement elem,
                 painter->setPen(QPen(checkMarkColor, 1));
                 painter->setBrush(gradient);
                 painter->drawRect(rect.adjusted(checkMarkPadding, checkMarkPadding, -checkMarkPadding, -checkMarkPadding));
+
             } else if (checkbox->state & State_On) {
-                qreal penWidth = QStyleHelper::dpiScaled(1.8);
-                penWidth = qMax(penWidth , 0.18 * rect.height());
-                penWidth = qMin(penWidth , 0.30 * rect.height());
+                qreal penWidth = QStyleHelper::dpiScaled(1.5);
+                penWidth = qMax(penWidth , 0.13 * rect.height());
+                penWidth = qMin(penWidth , 0.20 * rect.height());
+                QPen checkPen = QPen(checkMarkColor, penWidth);
                 checkMarkColor.setAlpha(210);
-                painter->setPen(QPen(checkMarkColor, penWidth));
+                painter->translate(dpiScaled(-0.8), dpiScaled(0.5));
+                painter->setPen(checkPen);
                 painter->setBrush(Qt::NoBrush);
-                painter->translate(-0.8, 0.5);
 
                 // Draw checkmark
                 QPainterPath path;
-                path.moveTo(1.33 * checkMarkPadding, rect.height() / 2.0);
-                path.lineTo(rect.width() / 2.0, rect.height() - checkMarkPadding);
-                path.lineTo(rect.width() - checkMarkPadding * 0.92, checkMarkPadding);
+                const qreal rectHeight = rect.height(); // assuming height equals width
+                path.moveTo(checkMarkPadding + rectHeight * 0.11, rectHeight * 0.47);
+                path.lineTo(rectHeight * 0.5, rectHeight - checkMarkPadding);
+                path.lineTo(rectHeight - checkMarkPadding, checkMarkPadding);
                 painter->drawPath(path.translated(rect.topLeft()));
             }
         }
@@ -1559,8 +1562,8 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
 
             bool ignoreCheckMark = false;
             const int checkColHOffset = windowsItemHMargin + windowsItemFrame - 1;
-            int checkcol = qMax(menuItem->rect.height() * 0.7,
-                                      qMax(menuItem->maxIconWidth * 1.0, dpiScaled(17))); // icon checkbox's highlihgt column width
+            int checkcol = qMax(menuItem->rect.height() * 0.79,
+                                      qMax(menuItem->maxIconWidth * 1.0, dpiScaled(21))); // icon checkbox's highlihgt column width
             if (
 #if QT_CONFIG(combobox)
                 qobject_cast<const QComboBox*>(widget) ||
@@ -1569,10 +1572,12 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
                 ignoreCheckMark = true; //ignore the checkmarks provided by the QComboMenuDelegate
 
             if (!ignoreCheckMark) {
-                // Check
-                const int boxMargin = dpiScaled(4);
-                const int boxWidth = checkcol - 2 * boxMargin;
-                QRect checkRect(option->rect.left() + boxMargin + checkColHOffset, option->rect.center().y() - boxWidth/2 + 1, boxWidth, boxWidth);
+                // Check, using qreal and QRectF to avoid error accumulation
+                const qreal boxMargin = dpiScaled(3.5);
+                const qreal boxWidth = checkcol - 2 * boxMargin;
+                QRectF checkRectF(option->rect.left() + boxMargin + checkColHOffset, option->rect.center().y() - boxWidth/2 + 1, boxWidth, boxWidth);
+                QRect checkRect = checkRectF.toRect();
+                checkRect.setWidth(checkRect.height()); // avoid .toRect() round error results in non-perfect square
                 checkRect = visualRect(menuItem->direction, menuItem->rect, checkRect);
                 if (checkable) {
                     if (menuItem->checkType & QStyleOptionMenuItem::Exclusive) {