diff --git a/data/test_data/md5sum.txt b/data/test_data/md5sum.txt
index 2f4e1a8..22053d6 100644
--- a/data/test_data/md5sum.txt
+++ b/data/test_data/md5sum.txt
@@ -1,4 +1,3 @@
-3c9b3ecd5a242f6601521e0b619fde01  bam_kmers_out/bam_1/fastqc_data.txt
 f59cf622d7d36b9d2f1170e6d63438ab  bam_mult_out/bam_1/fastqc_data.txt
 6318172912a6b7f9d348ce7b0b0618ed  bam_mult_out/bam_2/fastqc_data.txt
 f59cf622d7d36b9d2f1170e6d63438ab  bam_orig_dups_out/bam_1/fastqc_data.txt
@@ -13,3 +12,4 @@ be637ed4a4ebf2f1a64edf30ef1f8bb8  fastq_plain_out/fastq_1/fastqc_data.txt
 bc8fd6e40a0ca55cb00634bc306a896c  groups_out/bam_1/fastqc_data.txt
 a1952ae366bd7c7207f40db833b1d16b  sam_out/sam_1/fastqc_data.txt
 3fe18e2ee85e3912ede8c57559bf9f88  preseq_out/bam_1/preseq_hist.txt
+045639456fbe4a81b5de2789ceb95ddd  bam_kmers_out/bam_1/fastqc_data.txt
diff --git a/src/kmer_counter.cpp b/src/kmer_counter.cpp
index 8b05ccc..1d1f4e7 100644
--- a/src/kmer_counter.cpp
+++ b/src/kmer_counter.cpp
@@ -25,13 +25,6 @@
 #include <utility>  // IWYU pragma: keep
 #include <vector>
 
-[[nodiscard]] auto
-kmer_result::operator<=>(const kmer_result &rhs) const {
-  return obs_exp < rhs.obs_exp   ? std::strong_ordering::less
-         : obs_exp > rhs.obs_exp ? std::strong_ordering::greater
-                                 : std::strong_ordering::equal;
-}
-
 [[nodiscard]] auto
 kmer_result::decode() const -> std::string {
   return kmer_counter::decode_kmer(kmer, kmer_counter::kmer_size);
@@ -162,7 +155,9 @@ kmer_counter::get_kmer_results() const -> std::vector<kmer_result> {
     return x.obs_exp < min_obs_exp_to_report || x.pval > max_pval_to_report;
   });
   results.erase(std::cbegin(to_erase), std::cend(to_erase));
-  std::ranges::sort(results, std::greater{});
+  std::ranges::sort(results, [](const auto &a, const auto &b) {
+    return a.obs_exp > b.obs_exp || (a.obs_exp == b.obs_exp && a.kmer < b.kmer);
+  });
   if (std::size(results) > n_kmers_to_report)
     results.resize(n_kmers_to_report);
   return results;
diff --git a/src/kmer_counter.hpp b/src/kmer_counter.hpp
index 364bcce..2013f25 100644
--- a/src/kmer_counter.hpp
+++ b/src/kmer_counter.hpp
@@ -22,8 +22,6 @@ struct kmer_result {
   double obs_exp{};
   std::uint64_t pos{};
   [[nodiscard]] auto
-  operator<=>(const kmer_result &rhs) const;
-  [[nodiscard]] auto
   string() const -> std::string;
   [[nodiscard]] auto
   decode() const -> std::string;