diff --git a/src/insets/InsetIndex.cpp b/src/insets/InsetIndex.cpp
index 1dc8b4c1f9..72f18feef8 100644
--- a/src/insets/InsetIndex.cpp
+++ b/src/insets/InsetIndex.cpp
@@ -65,7 +65,7 @@ void InsetIndex::latex(otexstream & os, OutputParams const & runparams_in) const
 	if (buffer().masterBuffer()->params().use_indices && !params_.index.empty()
 	    && params_.index != "idx") {
 		os << "\\sindex[";
-        os << escape(params_.index);
+	os << escape(params_.index);
 		os << "]{";
 	} else {
 		os << "\\index";