diff --git a/src/hist/PedestalTrackingPixelHistogram.cpp b/src/hist/PedestalTrackingPixelHistogram.cpp
index 0cc36ff..b6cf17a 100644
--- a/src/hist/PedestalTrackingPixelHistogram.cpp
+++ b/src/hist/PedestalTrackingPixelHistogram.cpp
@@ -224,7 +224,8 @@ void PedestalTrackingPixelHistogram::worker_loop(int thread_id) {
                                          static_cast<AxisType>(my_pedestal.mean(
                                              static_cast<uint32_t>(local_row),
                                              static_cast<uint32_t>(col)));
-                    my_hist.fill(local_row, static_cast<int>(col), val);
+                    my_hist.fill_unchecked(local_row, static_cast<int>(col),
+                                           val);
                     const double sigma = my_std(local_row, col);
                     if (sigma > 0.0 &&
                         std::abs(static_cast<double>(val)) < n_sigma * sigma) {
diff --git a/src/hist/PixelHistogram.cpp b/src/hist/PixelHistogram.cpp
index 0a8af3a..2c2e088 100644
--- a/src/hist/PixelHistogram.cpp
+++ b/src/hist/PixelHistogram.cpp
@@ -124,7 +124,7 @@ void PixelHistogram::worker_loop(int thread_id) {
             const auto row = static_cast<ssize_t>(first_row + local_row);
             for (ssize_t col = 0; col < image.shape(1); ++col) {
                 const auto val = image(row, col);
-                my_hist.fill(local_row, static_cast<int>(col), val);
+                my_hist.fill_unchecked(local_row, static_cast<int>(col), val);
             }
         }