diff --git a/src/highlighter_group.hh b/src/highlighter_group.hh
index 9f813ccb..7cd525a6 100644
--- a/src/highlighter_group.hh
+++ b/src/highlighter_group.hh
@@ -19,7 +19,7 @@ class HighlighterGroup : public Highlighter
 public:
     void highlight(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range) override;
 
-    bool has_children() const { return true; }
+    bool has_children() const override { return true; }
     void add_child(HighlighterAndId&& hl) override;
     void remove_child(StringView id) override;
 
diff --git a/src/highlighters.cc b/src/highlighters.cc
index 286b22c6..091bbb4e 100644
--- a/src/highlighters.cc
+++ b/src/highlighters.cc
@@ -1096,7 +1096,7 @@ public:
             m_groups.append({m_default_group, HighlighterGroup{}});
     }
 
-    void highlight(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range)
+    void highlight(const Context& context, HighlightFlags flags, DisplayBuffer& display_buffer, BufferRange range) override
     {
         if (flags != HighlightFlags::Highlight)
             return;