diff --git a/kcms/fonts/package/contents/ui/main.qml b/kcms/fonts/package/contents/ui/main.qml
--- a/kcms/fonts/package/contents/ui/main.qml
+++ b/kcms/fonts/package/contents/ui/main.qml
@@ -221,6 +221,7 @@
             QtControls.SpinBox {
                 id: dpiSpinBox
                 stepSize: 24
+                editable: true
                 enabled: dpiCheckBox.checked
                 value: kcm.fontAASettings.dpi
                 onValueChanged: kcm.fontAASettings.dpi = dpiSpinBox.value