diff --git a/kcms/fonts/fonts.h b/kcms/fonts/fonts.h
--- a/kcms/fonts/fonts.h
+++ b/kcms/fonts/fonts.h
@@ -97,21 +97,22 @@
 
 #if defined(HAVE_FONTCONFIG) && HAVE_X11
 private:
-    int m_excludeTo;
-    int m_excludeToOriginal;
-    int m_excludeFrom;
-    int m_excludeFromOriginal;
-    int m_antiAliasing;
-    int m_antiAliasingOriginal;
-    int m_dpi;
-    int m_dpiOriginal;
+    int m_excludeTo = 0;
+    int m_excludeToOriginal = 0;
+    int m_excludeFrom = 0;
+    int m_excludeFromOriginal = 0;
+    int m_antiAliasing = 0;
+    int m_antiAliasingOriginal = 0;
+    int m_dpi = 0;
+    int m_dpiOriginal = 0;
     int m_subPixelCurrentIndex = 0;
-    int m_subPixelCurrentIndexOriginal;
+    int m_subPixelCurrentIndexOriginal = 0;
     int m_hintingCurrentIndex = 0;
-    int m_hintingCurrentIndexOriginal;
+    int m_hintingCurrentIndexOriginal = 0;
     QStandardItemModel *m_subPixelOptionsModel;
     QStandardItemModel *m_hintingOptionsModel;
     bool m_exclude = false;
+    bool m_excludeOriginal = false;
 #endif
 };
 
diff --git a/kcms/fonts/fonts.cpp b/kcms/fonts/fonts.cpp
--- a/kcms/fonts/fonts.cpp
+++ b/kcms/fonts/fonts.cpp
@@ -137,6 +137,7 @@
         m_excludeTo = 15;
         setExclude(false);
     }
+    m_excludeOriginal = m_exclude;
     m_excludeFromOriginal = m_excludeFrom;
     m_excludeToOriginal = m_excludeTo;
     excludeToChanged();
@@ -292,6 +293,7 @@
 #endif
 #endif
 
+    m_excludeOriginal = m_exclude;
     m_excludeToOriginal = m_excludeTo;
     m_excludeFromOriginal = m_excludeFrom;
     
@@ -426,7 +428,8 @@
         || m_antiAliasing != m_antiAliasingOriginal
         || m_dpi != m_dpiOriginal
         || m_subPixelCurrentIndex != m_subPixelCurrentIndexOriginal
-        || m_hintingCurrentIndex != m_hintingCurrentIndexOriginal;
+        || m_hintingCurrentIndex != m_hintingCurrentIndexOriginal
+        || m_exclude != m_excludeOriginal;
 }
 
 
@@ -450,6 +453,7 @@
 
     connect(m_fontAASettings, &FontAASettings::subPixelCurrentIndexChanged, this, updateState);
     connect(m_fontAASettings, &FontAASettings::hintingCurrentIndexChanged, this, updateState);
+    connect(m_fontAASettings, &FontAASettings::excludeChanged, this, updateState);
     connect(m_fontAASettings, &FontAASettings::excludeToChanged, this, updateState);
     connect(m_fontAASettings, &FontAASettings::antiAliasingChanged, this, updateState);
     connect(m_fontAASettings, &FontAASettings::aliasingChanged, this, updateState);