diff --git a/Sources/markdown-tool/Commands/FormatCommand.swift b/Sources/markdown-tool/Commands/FormatCommand.swift
index a998f8b4..2910b47d 100644
--- a/Sources/markdown-tool/Commands/FormatCommand.swift
+++ b/Sources/markdown-tool/Commands/FormatCommand.swift
@@ -209,7 +209,7 @@ extension MarkdownCommand {
             }
 
             guard let unorderedListMarker = MarkupFormatter.Options.UnorderedListMarker(argument: unorderedListMarker) else {
-                throw ArgumentParser.ValidationError("The value '\(self.emphasisMarker)' is invalid for '--unordered-list-marker'")
+                throw ArgumentParser.ValidationError("The value '\(self.unorderedListMarker)' is invalid for '--unordered-list-marker'")
             }
 
             let orderedListNumerals: MarkupFormatter.Options.OrderedListNumerals