diff --git a/src/blockencodings.h b/src/blockencodings.h
index be50166cfc..457ac4508b 100644
--- a/src/blockencodings.h
+++ b/src/blockencodings.h
@@ -92,12 +92,13 @@ private:
 
     friend class PartiallyDownloadedBlock;
 
-    static const int SHORTTXIDS_LENGTH = 6;
 protected:
     std::vector<uint64_t> shorttxids;
     std::vector<PrefilledTransaction> prefilledtxn;
 
 public:
+    static constexpr int SHORTTXIDS_LENGTH = 6;
+
     CBlockHeader header;
 
     // Dummy for deserialization
diff --git a/src/test/blockencodings_tests.cpp b/src/test/blockencodings_tests.cpp
index 8694891a51..14cf1a4a76 100644
--- a/src/test/blockencodings_tests.cpp
+++ b/src/test/blockencodings_tests.cpp
@@ -132,24 +132,7 @@ public:
         return base.GetShortID(txhash);
     }
 
-    ADD_SERIALIZE_METHODS;
-
-    template <typename Stream, typename Operation>
-    inline void SerializationOp(Stream& s, Operation ser_action) {
-        READWRITE(header);
-        READWRITE(nonce);
-        size_t shorttxids_size = shorttxids.size();
-        READWRITE(VARINT(shorttxids_size));
-        shorttxids.resize(shorttxids_size);
-        for (size_t i = 0; i < shorttxids.size(); i++) {
-            uint32_t lsb = shorttxids[i] & 0xffffffff;
-            uint16_t msb = (shorttxids[i] >> 32) & 0xffff;
-            READWRITE(lsb);
-            READWRITE(msb);
-            shorttxids[i] = (uint64_t(msb) << 32) | uint64_t(lsb);
-        }
-        READWRITE(prefilledtxn);
-    }
+    SERIALIZE_METHODS(TestHeaderAndShortIDs, obj) { READWRITE(obj.header, obj.nonce, Using<VectorFormatter<CustomUintFormatter<CBlockHeaderAndShortTxIDs::SHORTTXIDS_LENGTH>>>(obj.shorttxids), obj.prefilledtxn); }
 };
 
 BOOST_AUTO_TEST_CASE(NonCoinbasePreforwardRTTest)