diff --git a/src/editor.cc b/src/editor.cc
index 3655c0b4..13b4511f 100644
--- a/src/editor.cc
+++ b/src/editor.cc
@@ -24,13 +24,4 @@ std::vector<String> Editor::selections_content() const
     return contents;
 }
 
-void Editor::check_invariant() const
-{
-#ifdef KAK_DEBUG
-    kak_assert(not m_selections.empty());
-    m_selections.check_invariant();
-    buffer().check_invariant();
-#endif
-}
-
 }
diff --git a/src/editor.hh b/src/editor.hh
index d808fe76..c425da84 100644
--- a/src/editor.hh
+++ b/src/editor.hh
@@ -31,11 +31,6 @@ public:
     std::vector<String>  selections_content() const;
 
 private:
-    friend struct scoped_edition;
-    friend class InputModes::Insert;
-
-    void check_invariant() const;
-
     safe_ptr<Buffer>         m_buffer;
     DynamicSelectionList     m_selections;
 };