diff --git a/image_analysis/IndexAndRefine.h b/image_analysis/IndexAndRefine.h
index b009cfed..fe1ea0cd 100644
--- a/image_analysis/IndexAndRefine.h
+++ b/image_analysis/IndexAndRefine.h
@@ -47,7 +47,7 @@ class IndexAndRefine {
 
     mutable std::mutex reflections_mutex;
     std::vector<std::vector<Reflection>> reflections;
-    std::vector<double> mosaicity;
+    std::vector<float> mosaicity;
     std::vector<uint8_t> merge_mask;
 
     IndexingOutcome DetermineLatticeAndSymmetryRotation(DataMessage &msg);
diff --git a/image_analysis/scale_merge/ScaleOnTheFly.cpp b/image_analysis/scale_merge/ScaleOnTheFly.cpp
index b70dd255..cc3a9c64 100644
--- a/image_analysis/scale_merge/ScaleOnTheFly.cpp
+++ b/image_analysis/scale_merge/ScaleOnTheFly.cpp
@@ -166,7 +166,8 @@ std::pair<double, size_t> ScaleOnTheFly::CalculateGlobalCC(const std::vector<Ref
     return {cov / std::sqrt(var_x * var_y), n};
 }
 
-ScaleOnTheFlyResult ScaleOnTheFly::Scale(std::vector<Reflection> &reflections, std::optional<double> mosaicity_deg) {
+ScaleOnTheFlyResult ScaleOnTheFly::Scale(std::vector<Reflection> &reflections,
+    std::optional<float> mosaicity_deg) {
     auto start = std::chrono::steady_clock::now();
 
     ceres::Problem problem;
@@ -296,7 +297,7 @@ ScaleOnTheFlyResult ScaleOnTheFly::Scale(std::vector<Reflection> &reflections, s
 }
 
 ScalingResult ScaleOnTheFly::Scale(std::vector<std::vector<Reflection> > &reflections,
-                        const std::vector<double> &mosaicity,
+                        const std::vector<float> &mosaicity,
                         size_t nthreads) {
     ScalingResult result(reflections.size());
 
@@ -305,7 +306,7 @@ ScalingResult ScaleOnTheFly::Scale(std::vector<std::vector<Reflection> > &reflec
 
     if (nthreads <= 1) {
         for (int i = 0; i < reflections.size(); i++) {
-            std::optional<double> mos_val;
+            std::optional<float> mos_val;
             if (model == PartialityModel::Rotation
                 && mosaicity.size() > i
                 && std::isfinite(mosaicity[i])
diff --git a/image_analysis/scale_merge/ScaleOnTheFly.h b/image_analysis/scale_merge/ScaleOnTheFly.h
index 67007a23..fd214dd3 100644
--- a/image_analysis/scale_merge/ScaleOnTheFly.h
+++ b/image_analysis/scale_merge/ScaleOnTheFly.h
@@ -37,10 +37,10 @@ class ScaleOnTheFly {
     [[nodiscard]] std::pair<double, size_t> CalculateGlobalCC(const std::vector<Reflection> &reflections) const;
 public:
     ScaleOnTheFly(const DiffractionExperiment &x, const std::vector<MergedReflection> &ref);
-    ScaleOnTheFlyResult Scale(std::vector<Reflection> &r, std::optional<double> mosaicity_deg);
+    ScaleOnTheFlyResult Scale(std::vector<Reflection> &r, std::optional<float> mosaicity_deg);
 
     ScalingResult Scale(std::vector<std::vector<Reflection> > &reflections,
-                        const std::vector<double> &mosaicity,
+                        const std::vector<float> &mosaicity,
                         size_t nthreads = 0);
 };