diff --git a/src/platformtheme/kfontsettingsdata.h b/src/platformtheme/kfontsettingsdata.h
--- a/src/platformtheme/kfontsettingsdata.h
+++ b/src/platformtheme/kfontsettingsdata.h
@@ -32,6 +32,7 @@
     int Size;
     int Weight;
     QFont::StyleHint StyleHint;
+    const char *StyleName;
 };
 
 class KFontSettingsData : public QObject
diff --git a/src/platformtheme/kfontsettingsdata.cpp b/src/platformtheme/kfontsettingsdata.cpp
--- a/src/platformtheme/kfontsettingsdata.cpp
+++ b/src/platformtheme/kfontsettingsdata.cpp
@@ -53,13 +53,13 @@
 static const char DefaultFont[] =    "Noto Sans";
 
 static const KFontData DefaultFontData[KFontSettingsData::FontTypesCount] = {
-    { GeneralId, "font",                 DefaultFont,  10, -1, QFont::SansSerif },
-    { GeneralId, "fixed",                "Hack",  9, -1, QFont::Monospace },
-    { GeneralId, "toolBarFont",          DefaultFont,  9, -1, QFont::SansSerif },
-    { GeneralId, "menuFont",             DefaultFont,  10, -1, QFont::SansSerif },
-    { "WM",      "activeFont",           DefaultFont,  10, -1, QFont::SansSerif },
-    { GeneralId, "taskbarFont",          DefaultFont,  10, -1, QFont::SansSerif },
-    { GeneralId, "smallestReadableFont", DefaultFont,  8, -1, QFont::SansSerif }
+    { GeneralId, "font",                 DefaultFont,  10, -1, QFont::SansSerif, "Regular" },
+    { GeneralId, "fixed",                "Hack",  9, -1, QFont::Monospace, "Regular" },
+    { GeneralId, "toolBarFont",          DefaultFont,  9, -1, QFont::SansSerif, "Regular" },
+    { GeneralId, "menuFont",             DefaultFont,  10, -1, QFont::SansSerif, "Regular" },
+    { "WM",      "activeFont",           DefaultFont,  10, -1, QFont::SansSerif, "Regular" },
+    { GeneralId, "taskbarFont",          DefaultFont,  10, -1, QFont::SansSerif, "Regular" },
+    { GeneralId, "smallestReadableFont", DefaultFont,  8, -1, QFont::SansSerif, "Regular" }
 };
 
 QFont *KFontSettingsData::font(FontTypes fontType)
@@ -70,6 +70,7 @@
         const KFontData &fontData = DefaultFontData[fontType];
         cachedFont = new QFont(QLatin1String(fontData.FontName), fontData.Size, fontData.Weight);
         cachedFont->setStyleHint(fontData.StyleHint);
+        cachedFont->setStyleName(QLatin1String(fontData.StyleName));
 
         const KConfigGroup configGroup(mKdeGlobals, fontData.ConfigGroupKey);
         QString fontInfo = configGroup.readEntry(fontData.ConfigKey, QString());