diff --git a/ios/src/FilamentViewer.cpp b/ios/src/FilamentViewer.cpp
index d8daeb8b..e1a7d358 100644
--- a/ios/src/FilamentViewer.cpp
+++ b/ios/src/FilamentViewer.cpp
@@ -82,6 +82,7 @@
 #include <fstream>
 #include <filesystem>
 #include <mutex>
+#include <iomanip>
 
 #include "Log.hpp"