diff --git a/tests/cefclient/browser/client_handler_osr.h b/tests/cefclient/browser/client_handler_osr.h
index a8976873f..c0c29ba24 100644
--- a/tests/cefclient/browser/client_handler_osr.h
+++ b/tests/cefclient/browser/client_handler_osr.h
@@ -145,7 +145,7 @@ class ClientHandlerOsr : public ClientHandler,
  private:
   // Used to determine the object type.
   virtual const void* GetTypeKey() const override { return &kTypeKey; }
-  static const int kTypeKey = 0;
+  static constexpr int kTypeKey = 0;
 
   // Only accessed on the UI thread.
   OsrDelegate* osr_delegate_;
diff --git a/tests/cefclient/browser/client_handler_std.h b/tests/cefclient/browser/client_handler_std.h
index f589824b3..016c69978 100644
--- a/tests/cefclient/browser/client_handler_std.h
+++ b/tests/cefclient/browser/client_handler_std.h
@@ -25,7 +25,7 @@ class ClientHandlerStd : public ClientHandler {
  private:
   // Used to determine the object type.
   virtual const void* GetTypeKey() const override { return &kTypeKey; }
-  static const int kTypeKey = 0;
+  static constexpr int kTypeKey = 0;
 
   // Include the default reference counting implementation.
   IMPLEMENT_REFCOUNTING(ClientHandlerStd);
diff --git a/tests/cefclient/browser/default_client_handler.h b/tests/cefclient/browser/default_client_handler.h
index 08caa9a2d..7fed6fea7 100644
--- a/tests/cefclient/browser/default_client_handler.h
+++ b/tests/cefclient/browser/default_client_handler.h
@@ -24,7 +24,7 @@ class DefaultClientHandler : public BaseClientHandler {
  private:
   // Used to determine the object type.
   virtual const void* GetTypeKey() const override { return &kTypeKey; }
-  static const int kTypeKey = 0;
+  static constexpr int kTypeKey = 0;
 
   IMPLEMENT_REFCOUNTING(DefaultClientHandler);
   DISALLOW_COPY_AND_ASSIGN(DefaultClientHandler);