diff --git a/CarpetX/src/interpolate.cxx b/CarpetX/src/interpolate.cxx
index eee39a9a..2c490c68 100644
--- a/CarpetX/src/interpolate.cxx
+++ b/CarpetX/src/interpolate.cxx
@@ -664,6 +664,11 @@ extern "C" void CarpetX_Interpolate(const CCTK_POINTER_TO_CONST cctkGH_,
     givis.at(v) = {gi, vi};
   }

+  rat64 min_level_iteration_used =
+      std::numeric_limits<decltype(min_level_iteration_used.num)>::max();
+  rat64 max_level_iteration_used =
+      std::numeric_limits<decltype(max_level_iteration_used.num)>::min();
+  bool requires_interpolation_in_time = false;
   for (const auto &patchdata : ghext->patchdata) {
     const int patch = patchdata.patch;
     for (const auto &leveldata : patchdata.leveldata) {
@@ -676,6 +681,11 @@ extern "C" void CarpetX_Interpolate(const CCTK_POINTER_TO_CONST cctkGH_,
         const GridDesc grid(leveldata, mfp);
         // const int component = mfp.index();

+        min_level_iteration_used =
+            std::min(min_level_iteration_used, leveldata.iteration);
+        max_level_iteration_used =
--

Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2925/overflow-in-rat-in-arith