diff --git a/src/plugins/clangformat/clangformatbaseindenter.h b/src/plugins/clangformat/clangformatbaseindenter.h
index e20470321d8..70d59661710 100644
--- a/src/plugins/clangformat/clangformatbaseindenter.h
+++ b/src/plugins/clangformat/clangformatbaseindenter.h
@@ -79,7 +79,7 @@ private:
         void setCache(clang::format::FormatStyle newStyle, std::chrono::milliseconds timeout)
         {
             style = newStyle;
-            expirationTime = QDateTime::currentDateTime() + timeout;
+            expirationTime = QDateTime::currentDateTime().addMSecs(timeout.count());
         }
     };