diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -262,7 +262,10 @@
         m_settings->setMenuFont(applyFontDiff(m_settings->menuFont(), font, fontDiffFlags));
         m_settings->setToolBarFont(applyFontDiff(m_settings->toolBarFont(), font, fontDiffFlags));
         m_settings->setActiveFont(applyFontDiff(m_settings->activeFont(), font, fontDiffFlags));
-        m_settings->setSmallestReadableFont(applyFontDiff(m_settings->smallestReadableFont(), font, fontDiffFlags));
+
+        QFont smallerSmallestFont = font;
+        smallerSmallestFont.setPointSize(font.pointSize() - 2);
+        m_settings->setSmallestReadableFont(applyFontDiff(m_settings->smallestReadableFont(), smallerSmallestFont, fontDiffFlags));
 
         const QFont adjustedFont = applyFontDiff(m_settings->fixed(), font, fontDiffFlags);
         if (QFontInfo(adjustedFont).fixedPitch()) {