diff --git a/src/TocBackend.h b/src/TocBackend.h
index eefe7873c6..3f5a1c5893 100644
--- a/src/TocBackend.h
+++ b/src/TocBackend.h
@@ -166,7 +166,7 @@ private:
 	///
 	TocList tocs_;
 	///
-    std::map<std::string, std::unique_ptr<TocBuilder>> builders_;
+	std::map<std::string, std::unique_ptr<TocBuilder>> builders_;
 	/// Stores localised outliner names from this buffer and its children
 	std::map<std::string, docstring> outliner_names_;
 	///