diff --git a/qutebrowser/config/_sections.py b/qutebrowser/config/_sections.py
index 84728a6ab..1ea66482a 100644
--- a/qutebrowser/config/_sections.py
+++ b/qutebrowser/config/_sections.py
@@ -178,6 +178,9 @@ class ValueList(Section):
         changed = []
         mapping = ChainMap(self.layers['temp'], self.layers['conf'])
         for k, v in mapping.items():
-            if v.value != self.layers['default'][k].value:
+            try:
+                if v.value != self.layers['default'][k].value:
+                    changed.append((k, v.value))
+            except KeyError:
                 changed.append((k, v.value))
         return changed