diff --git a/src/bench/base58.cpp b/src/bench/base58.cpp
index 65e27a615d9..c74a958c8b1 100644
--- a/src/bench/base58.cpp
+++ b/src/bench/base58.cpp
@@ -22,7 +22,7 @@ static void Base58Encode(benchmark::State& state)
         }
     };
     while (state.KeepRunning()) {
-        EncodeBase58(buff.begin(), buff.end());
+        EncodeBase58(buff.data(), buff.data() + buff.size());
     }
 }
 
diff --git a/src/bench/checkqueue.cpp b/src/bench/checkqueue.cpp
index b7ae5c2d572..94064c9ca67 100644
--- a/src/bench/checkqueue.cpp
+++ b/src/bench/checkqueue.cpp
@@ -19,7 +19,7 @@ static const int MIN_CORES = 2;
 static const size_t BATCHES = 101;
 static const size_t BATCH_SIZE = 30;
 static const int PREVECTOR_SIZE = 28;
-static const int QUEUE_BATCH_SIZE = 128;
+static const unsigned int QUEUE_BATCH_SIZE = 128;
 static void CCheckQueueSpeed(benchmark::State& state)
 {
     struct FakeJobNoWork {
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 950bdd945cc..77c17c061c3 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -146,7 +146,7 @@ public:
         fRequireStandard = true;
         fMineBlocksOnDemand = false;
 
-        checkpointData = (CCheckpointData) {
+        checkpointData = {
             {
                 { 11111, uint256S("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d")},
                 { 33333, uint256S("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6")},
@@ -248,7 +248,7 @@ public:
         fMineBlocksOnDemand = false;
 
 
-        checkpointData = (CCheckpointData) {
+        checkpointData = {
             {
                 {546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")},
             }
@@ -319,7 +319,7 @@ public:
         fRequireStandard = false;
         fMineBlocksOnDemand = true;
 
-        checkpointData = (CCheckpointData) {
+        checkpointData = {
             {
                 {0, uint256S("0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206")},
             }
diff --git a/src/compat.h b/src/compat.h
index e022659c018..09657eccba5 100644
--- a/src/compat.h
+++ b/src/compat.h
@@ -31,6 +31,7 @@
 #include <mswsock.h>
 #include <windows.h>
 #include <ws2tcpip.h>
+#include <stdint.h>
 #else
 #include <sys/fcntl.h>
 #include <sys/mman.h>
@@ -71,6 +72,15 @@ typedef unsigned int SOCKET;
 #else
 #define MAX_PATH            1024
 #endif
+#ifdef _MSC_VER
+#if !defined(ssize_t)
+#ifdef _WIN64
+typedef int64_t ssize_t;
+#else
+typedef int32_t ssize_t;
+#endif
+#endif
+#endif
 
 #if HAVE_DECL_STRNLEN == 0
 size_t strnlen( const char *start, size_t max_len);
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 52387b32f45..82b09f5f14d 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -41,7 +41,7 @@ std::atomic<int64_t> nTimeBestReceived(0); // Used only to inform the wallet of
 struct IteratorComparator
 {
     template<typename I>
-    bool operator()(const I& a, const I& b)
+    bool operator()(const I& a, const I& b) const
     {
         return &(*a) < &(*b);
     }
diff --git a/src/random.h b/src/random.h
index c60ab361795..413adbd4644 100644
--- a/src/random.h
+++ b/src/random.h
@@ -128,7 +128,7 @@ public:
  * sure that the underlying OS APIs for all platforms support the number.
  * (many cap out at 256 bytes).
  */
-static const ssize_t NUM_OS_RANDOM_BYTES = 32;
+static const int NUM_OS_RANDOM_BYTES = 32;
 
 /** Get 32 bytes of system entropy. Do not use this in application code: use
  * GetStrongRandBytes instead.
diff --git a/src/support/cleanse.cpp b/src/support/cleanse.cpp
index 95899c9f02d..eb6e0a73a20 100644
--- a/src/support/cleanse.cpp
+++ b/src/support/cleanse.cpp
@@ -7,6 +7,10 @@
 
 #include <cstring>
 
+#if defined(_MSC_VER)
+#include <Windows.h> // For SecureZeroMemory.
+#endif
+
 /* Compilers have a bad habit of removing "superfluous" memset calls that
  * are trying to zero memory. For example, when memset()ing a buffer and
  * then free()ing it, the compiler might decide that the memset is
@@ -32,7 +36,7 @@ void memory_cleanse(void *ptr, size_t len)
        might try to eliminate "superfluous" memsets. If there's an easy way to
        detect memset_s, it would be better to use that. */
 #if defined(_MSC_VER)
-    __asm;
+    SecureZeroMemory(ptr, len);
 #else
     __asm__ __volatile__("" : : "r"(ptr) : "memory");
 #endif
diff --git a/src/test/checkqueue_tests.cpp b/src/test/checkqueue_tests.cpp
index c4564b45b00..162c597c30e 100644
--- a/src/test/checkqueue_tests.cpp
+++ b/src/test/checkqueue_tests.cpp
@@ -24,7 +24,7 @@
 // otherwise.
 BOOST_FIXTURE_TEST_SUITE(checkqueue_tests, TestingSetup)
 
-static const int QUEUE_BATCH_SIZE = 128;
+static const unsigned int QUEUE_BATCH_SIZE = 128;
 
 struct FakeCheck {
     bool operator()()