diff --git a/src/lib/hash-util.hh b/src/lib/hash-util.hh
index 3f41fc6f..a438578d 100644
--- a/src/lib/hash-util.hh
+++ b/src/lib/hash-util.hh
@@ -32,18 +32,17 @@ std::string hexHashStr(const TSrc &src)
     eng.process_bytes(src.data(), src.size());
 
     // export the hash as an array of unsigned int
-    typename TEng::digest_type dst;
+    using TDst = typename TEng::digest_type;
+    TDst dst;
     eng.get_digest(dst);
 
     // convert the hash to a vector of unsigned int
     static const size_t len = sizeof(dst) / sizeof(dst[0]);
-    const std::vector<unsigned> hash(dst, dst + len);
+    using TElem = typename std::remove_extent<TDst>::type;
+    const std::vector<TElem> hash(dst, dst + len);
 
     // convert the hash to a hex string
     std::string result;
-    boost::algorithm::hex(hash.begin(), hash.end(), back_inserter(result));
-
-    // convert uppercase letters to lowercase
-    boost::algorithm::to_lower(result);
+    boost::algorithm::hex_lower(hash.begin(), hash.end(), back_inserter(result));
     return result;
 }