diff --git a/libcef_dll/cpptoc/cpptoc_ref_counted.h b/libcef_dll/cpptoc/cpptoc_ref_counted.h
index 3e4294e5d..9fdff5dd5 100644
--- a/libcef_dll/cpptoc/cpptoc_ref_counted.h
+++ b/libcef_dll/cpptoc/cpptoc_ref_counted.h
@@ -143,7 +143,7 @@ class CefCppToCRefCounted : public CefBaseRefCounted {
 
   // Increment/decrement reference counts on only the underlying class.
   void UnderlyingAddRef() const { wrapper_struct_.object_->AddRef(); }
-  bool UnderlyingRelease() const { return wrapper_struct_.object_->Release(); }
+  void UnderlyingRelease() const { wrapper_struct_.object_->Release(); }
   bool UnderlyingHasOneRef() const {
     return wrapper_struct_.object_->HasOneRef();
   }
diff --git a/libcef_dll/wrapper_types.h b/libcef_dll/wrapper_types.h
index 40f254098..2b7daf50a 100644
--- a/libcef_dll/wrapper_types.h
+++ b/libcef_dll/wrapper_types.h
@@ -161,6 +161,8 @@ enum CefWrapperType {
   WT_X509CERTIFICATE,
   WT_XML_READER,
   WT_ZIP_READER,
+
+  WT_LAST
 };
 
 #endif  // CEF_LIBCEF_DLL_WRAPPER_TYPES_H_
diff --git a/tools/make_wrapper_types_header.py b/tools/make_wrapper_types_header.py
index cfa554429..09c9492f3 100644
--- a/tools/make_wrapper_types_header.py
+++ b/tools/make_wrapper_types_header.py
@@ -19,6 +19,7 @@ def make_wrapper_types_header(header):
   for clsname in clsnames:
     result += '  ' + get_wrapper_type_enum(clsname) + ',\n'
 
+  result += '\n  WT_LAST\n'
   result += '};\n\n' + \
             '#endif  // CEF_LIBCEF_DLL_WRAPPER_TYPES_H_'