diff --git a/image_analysis/IndexAndRefine.cpp b/image_analysis/IndexAndRefine.cpp
index 9a2023dd..275e28d3 100644
--- a/image_analysis/IndexAndRefine.cpp
+++ b/image_analysis/IndexAndRefine.cpp
@@ -115,6 +115,7 @@ void IndexAndRefine::RefineGeometryIfNeeded(DataMessage &msg, IndexAndRefine::In
         .refine_beam_center = true,
         .refine_distance_mm = false,
         .refine_detector_angles = false,
+        .refine_unit_cell = !experiment.IsRotationIndexing(),
         .max_time = 0.04 // 40 ms is max allowed time for the operation
     };
 
@@ -122,7 +123,6 @@ void IndexAndRefine::RefineGeometryIfNeeded(DataMessage &msg, IndexAndRefine::In
     if (outcome.symmetry.crystal_system == gemmi::CrystalSystem::Trigonal)
         data.crystal_system = gemmi::CrystalSystem::Hexagonal;
 
-
     switch (experiment.GetIndexingSettings().GetGeomRefinementAlgorithm()) {
         case GeomRefinementAlgorithmEnum::None:
             break;