diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6e004e98b..10c393af6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -361,6 +361,7 @@ else()
       -Wextra-semi
       -Werror=shadow
       -fsigned-char
+      -Wnon-virtual-dtor
 
       $<$<CXX_COMPILER_ID:CLANG>:
         $<$<VERSION_GREATER:$<CXX_COMPILER_VERSION>,3.8>:
diff --git a/src/namer.h b/src/namer.h
index 438c5eee8..ff0039406 100644
--- a/src/namer.h
+++ b/src/namer.h
@@ -108,6 +108,8 @@ class Namer {
   Namer(Config config, std::set<std::string> keywords)
       : config_(config), keywords_(std::move(keywords)) {}
 
+  virtual ~Namer() {}
+
   template<typename T> std::string Method(const T &s) const {
     return Method(s.name);
   }