diff --git a/src/miniz.h b/src/miniz.h
index 9b90ff8..808ad93 100644
--- a/src/miniz.h
+++ b/src/miniz.h
@@ -5388,13 +5388,9 @@ mz_bool mz_zip_reader_extract_to_mem_no_alloc(mz_zip_archive *pZip,
   } else {
     // Temporarily allocate a read buffer.
     read_buf_size = MZ_MIN(file_stat.m_comp_size, MZ_ZIP_MAX_IO_BUF_SIZE);
-#ifdef _MSC_VER
-    if (((0, sizeof(size_t) == sizeof(mz_uint32))) &&
-        (read_buf_size > 0x7FFFFFFF))
-#else
     if (((sizeof(size_t) == sizeof(mz_uint32))) && (read_buf_size > 0x7FFFFFFF))
-#endif
       return MZ_FALSE;
+
     if (NULL == (pRead_buf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1,
                                             (size_t)read_buf_size)))
       return MZ_FALSE;
@@ -5481,11 +5477,7 @@ void *mz_zip_reader_extract_to_heap(mz_zip_archive *pZip, mz_uint file_index,
   uncomp_size = MZ_READ_LE32(p + MZ_ZIP_CDH_DECOMPRESSED_SIZE_OFS);
 
   alloc_size = (flags & MZ_ZIP_FLAG_COMPRESSED_DATA) ? comp_size : uncomp_size;
-#ifdef _MSC_VER
-  if (((0, sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF))
-#else
   if (((sizeof(size_t) == sizeof(mz_uint32))) && (alloc_size > 0x7FFFFFFF))
-#endif
     return NULL;
   if (NULL ==
       (pBuf = pZip->m_pAlloc(pZip->m_pAlloc_opaque, 1, (size_t)alloc_size)))
@@ -5587,14 +5579,10 @@ mz_bool mz_zip_reader_extract_to_callback(mz_zip_archive *pZip,
   if ((flags & MZ_ZIP_FLAG_COMPRESSED_DATA) || (!file_stat.m_method)) {
     // The file is stored or the caller has requested the compressed data.
     if (pZip->m_pState->m_pMem) {
-#ifdef _MSC_VER
-      if (((0, sizeof(size_t) == sizeof(mz_uint32))) &&
-          (file_stat.m_comp_size > 0xFFFFFFFF))
-#else
       if (((sizeof(size_t) == sizeof(mz_uint32))) &&
           (file_stat.m_comp_size > 0xFFFFFFFF))
-#endif
         return MZ_FALSE;
+
       if (pCallback(pOpaque, out_buf_ofs, pRead_buf,
                     (size_t)file_stat.m_comp_size) != file_stat.m_comp_size)
         status = TINFL_STATUS_FAILED;
diff --git a/src/zip.c b/src/zip.c
index edf79cc..df9f0c6 100644
--- a/src/zip.c
+++ b/src/zip.c
@@ -43,7 +43,9 @@
 #include "zip.h"
 
 #ifdef _MSC_VER
-#define ftruncate(fd, sz) (-(_chsize_s((fd), (__int64)(sz)) != 0))
+#include <io.h>
+
+#define ftruncate(fd, sz) (-(_chsize_s((fd), (sz)) != 0))
 #define fileno _fileno
 #endif
 
@@ -760,6 +762,7 @@ int zip_entry_fread(struct zip_t *zip, const char *filename) {
   }
 
 #if defined(_MSC_VER)
+  (void)xattr; // unused
 #else
   if (!mz_zip_reader_file_stat(pzip, idx, &info)) {
     // Cannot get information about zip archive;
@@ -988,6 +991,7 @@ static int extract(mz_zip_archive *zip_archive, const char *dir,
       }
 
 #if defined(_MSC_VER)
+      (void)xattr; // unused
 #else
       xattr = (info.m_external_attr >> 16) & 0xFFFF;
       if (xattr > 0) {