Index: src/sddmkcm.cpp
===================================================================
--- src/sddmkcm.cpp
+++ src/sddmkcm.cpp
@@ -186,6 +186,11 @@
     KConfigGroup numLockConfigGroup(&numLockConfig, "Keyboard");
     QString numLock = numLockConfigGroup.readEntry("NumLock");
 
+    // Syncing the font only works with SDDM >= 0.19, but will not have a negative effect with older versions
+    KConfig plasmaFontConfig(QStringLiteral("kdeglobals"));
+    KConfigGroup plasmaFontGroup(&plasmaFontConfig, "General");
+    QString plasmaFont = plasmaFontGroup.readEntry("font");
+
     // define paths
     const QString fontconfigPath = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QStringLiteral("fontconfig"), QStandardPaths::LocateDirectory);
     const QString kdeglobalsPath = QStandardPaths::locate(QStandardPaths::GenericConfigLocation, QStringLiteral("kdeglobals"));
@@ -222,6 +227,13 @@
         qDebug() << "Cannot find NumLock value.";
     }
 
+    if (!plasmaFont.isEmpty()) {
+        args[QStringLiteral("kde_settings.conf/Theme/Font")] = plasmaFont;
+    }
+    else {
+        qDebug() << "Cannot find Plasma font value.";
+    }
+
     if (!fontconfigPath.isEmpty()) {
         args[QStringLiteral("fontconfig")] = fontconfigPath;
     } else {
@@ -284,6 +296,8 @@
 
     args[QStringLiteral("kde_settings.conf/General/Numlock")] = QVariant();
 
+    args[QStringLiteral("kde_settings.conf/Theme/Font")] = QVariant();
+
     KAuth::Action resetAction(QStringLiteral("org.kde.kcontrol.kcmsddm.reset"));
     resetAction.setHelperId(QStringLiteral("org.kde.kcontrol.kcmsddm"));
     resetAction.setArguments(args);