diff --git a/include/info.impl b/include/info.impl
index 02c3d6c..38347c9 100644
--- a/include/info.impl
+++ b/include/info.impl
@@ -1,6 +1,6 @@
 namespace sshash {
 
-double bits_per_kmer_formula(uint64_t k, /* kmer length */
+static double bits_per_kmer_formula(uint64_t k, /* kmer length */
                              uint64_t m, /* minimizer length */
                              uint64_t n, /* num. kmers */
                              uint64_t M) /* num. strings in SPSS */
@@ -90,4 +90,4 @@ void dictionary<kmer_t>::print_info() const {
     print_space_breakdown();
 }
 
-}  // namespace sshash
\ No newline at end of file
+}  // namespace sshash
diff --git a/include/minimizers.hpp b/include/minimizers.hpp
index 61985d6..d9be4ce 100644
--- a/include/minimizers.hpp
+++ b/include/minimizers.hpp
@@ -29,10 +29,6 @@ struct minimizers {
 
         mphf_config.ram = 4 * essentials::GB;
         mphf_config.tmp_dir = build_config.tmp_dirname;
-        if (size <= 1) {
-            throw std::runtime_error(
-                "each partition must contain more than one key: use less partitions");
-        }
         m_mphf.build_in_external_memory(begin, size, mphf_config);
     }