diff --git a/src/utils/kateconfig.h b/src/utils/kateconfig.h
--- a/src/utils/kateconfig.h
+++ b/src/utils/kateconfig.h
@@ -791,6 +791,12 @@
      */
     void setSchemaInternal(const QString &schema);
 
+    /**
+     * Set the font but drop style name before that.
+     * Otherwise e.g. styles like bold/italic/... will not work
+     */
+    void setFontWithDroppedStyleName(const QFont &font);
+
     QString m_schema;
     QFont m_font;
     QFontMetricsF m_fontMetrics;
diff --git a/src/utils/kateconfig.cpp b/src/utils/kateconfig.cpp
--- a/src/utils/kateconfig.cpp
+++ b/src/utils/kateconfig.cpp
@@ -2494,11 +2494,7 @@
         m_lineMarkerColor[i] = col;
     }
 
-    QFont f(QFontDatabase::systemFont(QFontDatabase::FixedFont));
-
-    m_font = config.readEntry("Font", f);
-    m_fontMetrics = QFontMetricsF(m_font);
-    m_fontSet = true;
+    setFontWithDroppedStyleName(config.readEntry("Font", QFontDatabase::systemFont(QFontDatabase::FixedFont)));
 
     m_templateBackgroundColor = config.readEntry(QStringLiteral("Color Template Background"), colors.color(Kate::TemplateBackground));
 
@@ -2539,12 +2535,19 @@
     }
 
     configStart();
+    setFontWithDroppedStyleName(font);
+    configEnd();
+}
 
-    m_fontSet = true;
+void KateRendererConfig::setFontWithDroppedStyleName(const QFont &font)
+{
+    /**
+     * Drop styleName, otherwise stuff like bold/italic/... won't work as style!
+     */
     m_font = font;
+    m_font.setStyleName(QString());
     m_fontMetrics = QFontMetricsF(m_font);
-
-    configEnd();
+    m_fontSet = true;
 }
 
 bool KateRendererConfig::wordWrapMarker() const