diff --git a/src/misc.h b/src/misc.h
index 1471b1b6a..ff9d2c284 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -457,6 +457,8 @@ void move_to_front(std::vector<T>& vec, Predicate pred) {
                     __builtin_unreachable(); \
             } while (0)
     #endif
+#elif defined(_MSC_VER)
+    #define sf_assume(cond) __assume(cond)
 #else
     // do nothing for other compilers
     #define sf_assume(cond)
@@ -464,6 +466,8 @@ void move_to_front(std::vector<T>& vec, Predicate pred) {
 
 #ifdef __GNUC__
     #define sf_unreachable() __builtin_unreachable()
+#elif defined(_MSC_VER)
+    #define sf_unreachable() __assume(0)
 #else
     #define sf_unreachable()
 #endif
diff --git a/src/nnue/nnue_common.h b/src/nnue/nnue_common.h
index 27852ac7b..bd546d277 100644
--- a/src/nnue/nnue_common.h
+++ b/src/nnue/nnue_common.h
@@ -216,7 +216,7 @@ inline void read_leb_128(std::istream& stream, Arrays&... outs) {
 
     auto                           bytes_left = read_little_endian<std::uint32_t>(stream);
     std::array<std::uint8_t, 8192> buf;
-    std::uint32_t                  buf_pos = buf.size();
+    std::uint32_t                  buf_pos = std::uint32_t(buf.size());
 
     (read_leb_128_detail(stream, outs, bytes_left, buf, buf_pos), ...);