diff --git a/src/highlighters.cc b/src/highlighters.cc
index 36a0213a..a2987909 100644
--- a/src/highlighters.cc
+++ b/src/highlighters.cc
@@ -1835,7 +1835,7 @@ public:
         ++m_regions_timestamp;
     }
 
-    void remove_child(StringView id)
+    void remove_child(StringView id) override
     {
         if (id == m_default_region)
             m_default_region = String{};