diff --git a/src/node/blockstorage.cpp b/src/node/blockstorage.cpp
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -126,8 +126,8 @@
 
     // last block to prune is the lesser of (user-specified height,
     // MIN_BLOCKS_TO_KEEP from the tip)
-    unsigned int nLastBlockWeCanPrune = std::min(
-        (unsigned)nManualPruneHeight, chain_tip_height - MIN_BLOCKS_TO_KEEP);
+    unsigned int nLastBlockWeCanPrune{std::min(
+        (unsigned)nManualPruneHeight, chain_tip_height - MIN_BLOCKS_TO_KEEP)};
     int count = 0;
     for (int fileNumber = 0; fileNumber < m_last_blockfile; fileNumber++) {
         if (m_blockfile_info[fileNumber].nSize == 0 ||
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2216,7 +2216,7 @@
     int64_t cacheSize = CoinsTip().DynamicMemoryUsage();
     int64_t nTotalSpace =
         max_coins_cache_size_bytes +
-        std::max<int64_t>(max_mempool_size_bytes - nMempoolUsage, 0);
+        std::max<int64_t>(int64_t(max_mempool_size_bytes) - nMempoolUsage, 0);
 
     //! No need to periodic flush if at least this much space still available.
     static constexpr int64_t MAX_BLOCK_COINSDB_USAGE_BYTES =
@@ -4347,8 +4347,8 @@
     // blocks which are too close in height to the tip.  Apply this test
     // regardless of whether pruning is enabled; it should generally be safe to
     // not process unrequested blocks.
-    bool fTooFarAhead =
-        (pindex->nHeight > int(m_chain.Height() + MIN_BLOCKS_TO_KEEP));
+    bool fTooFarAhead{pindex->nHeight >
+                      m_chain.Height() + int(MIN_BLOCKS_TO_KEEP)};
 
     // TODO: Decouple this function from the block download logic by removing
     // fRequested
@@ -5024,7 +5024,7 @@
             try {
                 // Locate a header.
                 uint8_t buf[CMessageHeader::MESSAGE_START_SIZE];
-                blkdat.FindByte(m_params.DiskMagic()[0]);
+                blkdat.FindByte(char(m_params.DiskMagic()[0]));
                 nRewind = blkdat.GetPos() + 1;
                 blkdat >> buf;
                 if (memcmp(buf, m_params.DiskMagic().data(),
diff --git a/test/sanitizer_suppressions/ubsan b/test/sanitizer_suppressions/ubsan
--- a/test/sanitizer_suppressions/ubsan
+++ b/test/sanitizer_suppressions/ubsan
@@ -63,7 +63,6 @@
 implicit-integer-sign-change:test/transaction_tests.cpp
 implicit-integer-sign-change:txmempool.cpp
 implicit-integer-sign-change:util/strencodings.*
-implicit-integer-sign-change:validation.cpp
 implicit-integer-sign-change:zmq/zmqpublishnotifier.cpp
 implicit-signed-integer-truncation,implicit-integer-sign-change:chain.h
 implicit-signed-integer-truncation,implicit-integer-sign-change:test/skiplist_tests.cpp