diff --git a/db/memtable.cc b/db/memtable.cc
index bfec0a7..287afdb 100644
--- a/db/memtable.cc
+++ b/db/memtable.cc
@@ -101,7 +101,7 @@ void MemTable::Add(SequenceNumber s, ValueType type,
   p += 8;
   p = EncodeVarint32(p, val_size);
   memcpy(p, value.data(), val_size);
-  assert((p + val_size) - buf == encoded_len);
+  assert(p + val_size == buf + encoded_len);
   table_.Insert(buf);
 }
 
diff --git a/db/version_set.cc b/db/version_set.cc
index 02cc66f..c27ccad 100644
--- a/db/version_set.cc
+++ b/db/version_set.cc
@@ -20,7 +20,7 @@
 
 namespace leveldb {
 
-static int TargetFileSize(const Options* options) {
+static size_t TargetFileSize(const Options* options) {
   return options->max_file_size;
 }