diff --git a/kcms/fonts/fonts.h b/kcms/fonts/fonts.h
--- a/kcms/fonts/fonts.h
+++ b/kcms/fonts/fonts.h
@@ -183,6 +183,7 @@
 
 private:
     void updateNeedsSave();
+    void saveFontToGtkSettings();
     QFont applyFontDiff(const QFont &fnt, const QFont &newFont, int fontDiffFlags);
 
     QFont m_defaultFont;
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -34,6 +34,7 @@
 #include <QFontDialog>
 #include <QApplication>
 #include <QFontDatabase>
+#include <QStandardPaths>
 
 #include <KAcceleratorManager>
 #include <KGlobalSettings>
@@ -45,6 +46,10 @@
 #include <KFontDialog>
 #include <KWindowSystem>
 #include <KMessageBox>
+#include <QDBusConnection>
+
+#include <QDBusConnection>
+#include <QDBusInterface>
 
 #include "../krdb/krdb.h"
 #include "previewimageprovider.h"
@@ -569,6 +574,8 @@
     cg.writeEntry("activeFont", m_windowTitleFont.toString());
     cg.sync();
 
+    saveFontToGtkSettings();
+
     m_defaultFontOriginal = m_defaultFont;
     m_generalFontOriginal = m_generalFont;
     m_fixedWidthFontOriginal = m_fixedWidthFont;
@@ -602,6 +609,16 @@
     setNeedsSave(false);
 }
 
+void KFonts::saveFontToGtkSettings()
+{
+    QDBusInterface kdedInterface {
+        QStringLiteral("org.kde.kded5"),
+        QStringLiteral("/modules/gtkconfig"),
+        QStringLiteral("org.kde.gtkconfig")
+    };
+    kdedInterface.call("setFont", m_generalFont.toString());
+}
+
 void KFonts::updateNeedsSave()
 {
     setNeedsSave(m_defaultFontOriginal != m_defaultFont ||