diff --git a/include/rotgen/dynamic/map.hpp b/include/rotgen/dynamic/map.hpp
index 6f19b7f..8bd2732 100644
--- a/include/rotgen/dynamic/map.hpp
+++ b/include/rotgen/dynamic/map.hpp
@@ -77,7 +77,7 @@ namespace rotgen
 
     map& operator=(map const& other) requires(!is_immutable)
     {
-      base() = static_cast<parent const &>(*other);
+      base() = static_cast<parent const &>(other);
       return *this;
     }