diff --git a/qutebrowser/config/configfiles.py b/qutebrowser/config/configfiles.py
index 400816656..77b5190ce 100644
--- a/qutebrowser/config/configfiles.py
+++ b/qutebrowser/config/configfiles.py
@@ -182,12 +182,12 @@ class YamlConfig(QObject):
 
     def _validate(self):
         """Make sure all settings exist."""
-        for name in self._values:
-            if name not in configdata.DATA:
-                desc = configexc.ConfigErrorDesc(
-                    "While loading options",
-                    "Unknown option {}".format(name))
-                raise configexc.ConfigFileErrors('autoconfig.yml', [desc])
+        unknown = set(self._values) - set(configdata.DATA)
+        if unknown:
+            errors = [configexc.ConfigErrorDesc("While loading options",
+                                                "Unknown option {}".format(e))
+                      for e in sorted(unknown)]
+            raise configexc.ConfigFileErrors('autoconfig.yml', errors)
 
     def unset(self, name):
         """Remove the given option name if it's configured."""
diff --git a/tests/unit/config/test_configfiles.py b/tests/unit/config/test_configfiles.py
index d2f37ec25..63f6fbd3f 100644
--- a/tests/unit/config/test_configfiles.py
+++ b/tests/unit/config/test_configfiles.py
@@ -127,6 +127,20 @@ class TestYaml:
         assert error.text == "While loading options"
         assert str(error.exception) == "Unknown option hello"
 
+    def test_multiple_unknown_keys(self, yaml, config_tmpdir):
+        """With multiple unknown settings, all should be shown."""
+        autoconfig = config_tmpdir / 'autoconfig.yml'
+        autoconfig.write_text('global:\n  one: 1\n  two: 2', encoding='utf-8')
+
+        with pytest.raises(configexc.ConfigFileErrors) as excinfo:
+            yaml.load()
+
+        assert len(excinfo.value.errors) == 2
+        error1, error2 = excinfo.value.errors
+        assert error1.text == error2.text == "While loading options"
+        assert str(error1.exception) == "Unknown option one"
+        assert str(error2.exception) == "Unknown option two"
+
     def test_deleted_key(self, monkeypatch, yaml, config_tmpdir):
         """A key marked as deleted should be removed."""
         autoconfig = config_tmpdir / 'autoconfig.yml'