diff --git a/kcms/fonts/CMakeLists.txt b/kcms/fonts/CMakeLists.txt
--- a/kcms/fonts/CMakeLists.txt
+++ b/kcms/fonts/CMakeLists.txt
@@ -17,7 +17,9 @@
 endif()
 
 set(klauncher_xml ${KINIT_DBUS_INTERFACES_DIR}/kf5_org.kde.KLauncher.xml)
+set(kdegtkconfigd_xml ${KINIT_DBUS_INTERFACES_DIR}/org.kde.gtkConfigd.xml)
 qt5_add_dbus_interface(kcm_fonts_PART_SRCS ${klauncher_xml} klauncher_iface)
+qt5_add_dbus_interface(kcm_fonts_PART_SRCS ${kdegtkconfigd_xml} kdegtkconfigd)
 
 add_library(kcm_fonts MODULE ${kcm_fonts_PART_SRCS})
 
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>
@@ -45,9 +46,11 @@
 #include <KFontDialog>
 #include <KWindowSystem>
 #include <KMessageBox>
+#include <QDBusConnection>
 
 #include "../krdb/krdb.h"
 #include "previewimageprovider.h"
+#include "kdegtkconfigd.h"
 
 /**** DLL Interface ****/
 K_PLUGIN_FACTORY_WITH_JSON(KFontsFactory, "kcm_fonts.json", registerPlugin<KFonts>();)
@@ -569,6 +572,8 @@
     cg.writeEntry("activeFont", m_windowTitleFont.toString());
     cg.sync();
 
+    saveFontToGtkSettings();
+
     m_defaultFontOriginal = m_defaultFont;
     m_generalFontOriginal = m_generalFont;
     m_fixedWidthFontOriginal = m_fixedWidthFont;
@@ -602,6 +607,20 @@
     setNeedsSave(false);
 }
 
+void KFonts::saveFontToGtkSettings()
+{
+    org::kde::gtkConfigd gtkDaemonInterface {
+        "org.kde.gtkConfigd",
+        "/KdeGtkConfigd",
+        QDBusConnection::sessionBus(),
+        this
+    };
+    QString fontAsGtkConfigString = m_generalFont.family() + " "
+            + m_generalFont.styleName() + " "
+            + QString::number(m_generalFont.pointSize());
+    gtkDaemonInterface.changeGtkFont(fontAsGtkConfigString);
+}
+
 void KFonts::updateNeedsSave()
 {
     setNeedsSave(m_defaultFontOriginal != m_defaultFont ||