diff --git a/src/libhictk/balancing/include/hictk/balancing/ice.hpp b/src/libhictk/balancing/include/hictk/balancing/ice.hpp
index ce492da6a..fdae19dc2 100644
--- a/src/libhictk/balancing/include/hictk/balancing/ice.hpp
+++ b/src/libhictk/balancing/include/hictk/balancing/ice.hpp
@@ -145,12 +145,12 @@ class ICE {
 
   template <typename MatrixT>
   static void initialize_biases(const MatrixT& matrix, nonstd::span<double> biases,
-                                nonstd::span<const std::size_t> chrom_bin_offsets,
+                                nonstd::span<const std::uint64_t> chrom_bin_offsets,
                                 std::size_t min_nnz, std::size_t min_count, double mad_max,
                                 BS::thread_pool* tpool);
 
   [[nodiscard]] static std::vector<double> compute_weights_from_chromosome_sizes(
-      const BinTable& bins, nonstd::span<std::size_t> chrom_bin_offsets);
+      const BinTable& bins, nonstd::span<std::uint64_t> chrom_bin_offsets);
 };
 
 }  // namespace hictk::balancing
diff --git a/src/libhictk/balancing/include/hictk/balancing/impl/ice_impl.hpp b/src/libhictk/balancing/include/hictk/balancing/impl/ice_impl.hpp
index db036cb40..3e384cb98 100644
--- a/src/libhictk/balancing/include/hictk/balancing/impl/ice_impl.hpp
+++ b/src/libhictk/balancing/include/hictk/balancing/impl/ice_impl.hpp
@@ -601,7 +601,7 @@ inline double ICE::compute_ssq_nzmarg(nonstd::span<const double> marg, double av
 
 template <typename MatrixT>
 inline void ICE::initialize_biases(const MatrixT& matrix, nonstd::span<double> biases,
-                                   nonstd::span<const std::size_t> chrom_bin_offsets,
+                                   nonstd::span<const std::uint64_t> chrom_bin_offsets,
                                    std::size_t min_nnz, std::size_t min_count, double mad_max,
                                    BS::thread_pool* tpool) {
   if (min_nnz == 0 && min_count == 0 && mad_max == 0) {
@@ -631,7 +631,7 @@ inline void ICE::initialize_biases(const MatrixT& matrix, nonstd::span<double> b
 }
 
 inline std::vector<double> ICE::compute_weights_from_chromosome_sizes(
-    const BinTable& bins, nonstd::span<std::size_t> chrom_bin_offsets) {
+    const BinTable& bins, nonstd::span<std::uint64_t> chrom_bin_offsets) {
   std::vector<double> weights(bins.size());
   for (std::uint32_t i = 1; i < chrom_bin_offsets.size(); ++i) {
     const auto& chrom = bins.chromosomes().at(i - 1);