diff --git a/src/archive/plugins/ZzipArchivePlugin.cxx b/src/archive/plugins/ZzipArchivePlugin.cxx
index 31698b978..00fcc6056 100644
--- a/src/archive/plugins/ZzipArchivePlugin.cxx
+++ b/src/archive/plugins/ZzipArchivePlugin.cxx
@@ -54,7 +54,7 @@ class ZzipArchiveFile final : public ArchiveFile {
 	std::shared_ptr<ZzipDir> dir;
 
 public:
-	ZzipArchiveFile(std::shared_ptr<ZzipDir> &&_dir)
+	explicit ZzipArchiveFile(std::shared_ptr<ZzipDir> &&_dir) noexcept
 		:dir(std::move(_dir)) {}
 
 	virtual void Visit(ArchiveVisitor &visitor) override;