diff --git a/src/insets/InsetInclude.cpp b/src/insets/InsetInclude.cpp
index 1e023fba10..a755de4109 100644
--- a/src/insets/InsetInclude.cpp
+++ b/src/insets/InsetInclude.cpp
@@ -882,7 +882,7 @@ void InsetInclude::addPreview(graphics::PreviewLoader & ploader) const
 }
 
 
-void InsetInclude::addToToc(TocList & toclist, Buffer const & buffer, ParConstIterator & pit) const
+void InsetInclude::addToToc(TocList & toclist, Buffer const & buffer, ParConstIterator const & pit) const
 {
 	if (isListings(params_)) {
 		InsetListingsParams params(params_.getOptions());
diff --git a/src/insets/InsetInclude.h b/src/insets/InsetInclude.h
index 873521592e..7e981b9c83 100644
--- a/src/insets/InsetInclude.h
+++ b/src/insets/InsetInclude.h
@@ -95,7 +95,7 @@ public:
 	///
 	void addPreview(graphics::PreviewLoader &) const;
 	///
-	void addToToc(TocList &, Buffer const &, ParConstIterator &) const;
+	void addToToc(TocList &, Buffer const &, ParConstIterator const &) const;
 	///
 	void updateLabels(Buffer const & buffer) const;
 	///