diff --git a/src/Extension/InlinesOnly/InlinesOnlyExtension.php b/src/Extension/InlinesOnly/InlinesOnlyExtension.php
index 7777510..f85fad5 100644
--- a/src/Extension/InlinesOnly/InlinesOnlyExtension.php
+++ b/src/Extension/InlinesOnly/InlinesOnlyExtension.php
@@ -30,6 +30,7 @@ final class InlinesOnlyExtension implements ConfigurableExtensionInterface
             'use_underscore' => Expect::bool(true),
             'enable_strong' => Expect::bool(true),
             'enable_em' => Expect::bool(true),
+            'unordered_list_markers' => Expect::listOf('string')->min(1)->default(['*', '+', '-'])->mergeDefaults(false),
         ]));
     }
 
diff --git a/tests/functional/Extension/InlinesOnly/InlinesOnlyFunctionalTest.php b/tests/functional/Extension/InlinesOnly/InlinesOnlyFunctionalTest.php
index 8b06183..60b55a3 100644
--- a/tests/functional/Extension/InlinesOnly/InlinesOnlyFunctionalTest.php
+++ b/tests/functional/Extension/InlinesOnly/InlinesOnlyFunctionalTest.php
@@ -64,4 +64,20 @@ final class InlinesOnlyFunctionalTest extends TestCase
             [$markdown, $html],
         ];
     }
+
+    /**
+     * InlinesOnlyExtension reuses the shared 'commonmark' config schema, so the
+     * option must be accepted even though it renders no lists.
+     *
+     * @see https://github.com/thephpleague/commonmark/issues/1015
+     */
+    public function testUnorderedListMarkersConfigIsAccepted(): void
+    {
+        $environment = new Environment(['commonmark' => ['unordered_list_markers' => ['*']]]);
+        $environment->addExtension(new InlinesOnlyExtension());
+        $converter = new MarkdownConverter($environment);
+
+        $this->assertSame(['*'], $environment->getConfiguration()->get('commonmark/unordered_list_markers'));
+        $this->assertSame('<em>foo</em>', \trim($converter->convert('*foo*')->getContent()));
+    }
 }