diff --git a/src/calibre/gui2/progress_indicator/CalibreStyle.cpp b/src/calibre/gui2/progress_indicator/CalibreStyle.cpp
index 08f394d7a6..c72adf1eef 100644
--- a/src/calibre/gui2/progress_indicator/CalibreStyle.cpp
+++ b/src/calibre/gui2/progress_indicator/CalibreStyle.cpp
@@ -292,12 +292,12 @@ void CalibreStyle::drawControl(ControlElement element, const QStyleOption *optio
             painter->setRenderHint(QPainter::Antialiasing, true);
             const bool horizontal = (option->state & QStyle::State_Horizontal) ? true : false;
             static const int dot_count = 4;
-            const int handle_width = pixelMetric(PM_SplitterWidth, option, widget);
-            const int available_diameter = horizontal ? option->rect.width() : option->rect.height();
-            const int dot_size = std::max(1, std::min(handle_width, available_diameter));
+            const float handle_width = pixelMetric(PM_SplitterWidth, option, widget);
+            const float available_diameter = (horizontal ? option->rect.width() : option->rect.height());
+            const float dot_size = std::max(1.f, std::min(handle_width, available_diameter - 1));
             const int start_point = (horizontal ? option->rect.height()/2 : option->rect.width()/2) - (dot_count*dot_size/2);
-            const int offset = (available_diameter - dot_size) / 2;
-            QRect dot_rect = QRect(option->rect.left(), option->rect.top(), dot_size, dot_size);
+            const float offset = (available_diameter - dot_size) / 2.f;
+            QRectF dot_rect = QRectF(option->rect.left(), option->rect.top(), dot_size, dot_size);
             if (horizontal) dot_rect.moveLeft(dot_rect.left() + offset);
             else dot_rect.moveTop(dot_rect.top() + offset);
             for (int i = 0; i < dot_count; i++) {