diff --git a/src/google_breakpad/processor/minidump.h b/src/google_breakpad/processor/minidump.h
index a80a5efd..f3f77677 100644
--- a/src/google_breakpad/processor/minidump.h
+++ b/src/google_breakpad/processor/minidump.h
@@ -79,7 +79,9 @@
 #ifndef GOOGLE_BREAKPAD_PROCESSOR_MINIDUMP_H__
 #define GOOGLE_BREAKPAD_PROCESSOR_MINIDUMP_H__
 
+#ifndef _WIN32
 #include <unistd.h>
+#endif
 
 #include <iostream>
 #include <map>
diff --git a/src/processor/logging.cc b/src/processor/logging.cc
index 8842df35..c58fb8dd 100644
--- a/src/processor/logging.cc
+++ b/src/processor/logging.cc
@@ -44,13 +44,21 @@
 
 namespace google_breakpad {
 
+#ifdef _WIN32
+#define snprintf _snprintf
+#endif
+
 LogStream::LogStream(std::ostream &stream, Severity severity,
                      const char *file, int line)
     : stream_(stream) {
   time_t clock;
   time(&clock);
   struct tm tm_struct;
+#ifdef _WIN32
+  localtime_s(&tm_struct, &clock);
+#else
   localtime_r(&clock, &tm_struct);
+#endif
   char time_string[20];
   strftime(time_string, sizeof(time_string), "%Y-%m-%d %H:%M:%S", &tm_struct);
 
diff --git a/src/processor/logging.h b/src/processor/logging.h
index b638ff58..642506d5 100644
--- a/src/processor/logging.h
+++ b/src/processor/logging.h
@@ -68,6 +68,15 @@
 
 namespace google_breakpad {
 
+// These are defined in Microsoft headers.
+#ifdef SEVERITY_ERROR
+#undef SEVERITY_ERROR
+#endif
+
+#ifdef ERROR
+#undef ERROR
+#endif
+
 class LogStream {
  public:
   enum Severity {
diff --git a/src/processor/minidump.cc b/src/processor/minidump.cc
index 41e7cea6..3d42c428 100644
--- a/src/processor/minidump.cc
+++ b/src/processor/minidump.cc
@@ -40,14 +40,15 @@
 #include <stdio.h>
 #include <string.h>
 #include <time.h>
-#include <unistd.h>
+
 #ifdef _WIN32
 #include <io.h>
 typedef SSIZE_T ssize_t;
-#define open _open
-#define read _read
-#define lseek _lseek
+#define PRIx64 "llx"
+#define PRIx32 "lx"
+#define snprintf _snprintf
 #else  // _WIN32
+#include <unistd.h>
 #define O_BINARY 0
 #endif  // _WIN32
 
@@ -1101,7 +1102,7 @@ void MinidumpMemoryRegion::SetDescriptor(MDMemoryDescriptor* descriptor) {
   descriptor_ = descriptor;
   valid_ = descriptor &&
            descriptor_->memory.data_size <=
-               numeric_limits<uint64_t>::max() -
+               numeric_limits<u_int64_t>::max() -
                descriptor_->start_of_memory_range;
 }
 
@@ -3694,7 +3695,11 @@ void Minidump::Print() {
   printf("  stream_directory_rva = 0x%x\n",    header_.stream_directory_rva);
   printf("  checksum             = 0x%x\n",    header_.checksum);
   struct tm timestruct;
+#ifdef _WIN32
+  gmtime_s(&timestruct, reinterpret_cast<time_t*>(&header_.time_date_stamp));
+#else
   gmtime_r(reinterpret_cast<time_t*>(&header_.time_date_stamp), &timestruct);
+#endif
   char timestr[20];
   strftime(timestr, 20, "%Y-%m-%d %H:%M:%S", &timestruct);
   printf("  time_date_stamp      = 0x%x %s\n", header_.time_date_stamp,