diff --git a/main.cpp b/main.cpp
index 4b2afa54d..6738569ff 100644
--- a/main.cpp
+++ b/main.cpp
@@ -19,6 +19,8 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
+#elif defined (_POSIX_MAPPED_FILES)
+#include <sys/mman.h>
 #endif
 
 #define ROUNDUP(X, K) (((X) + (K)-1) & -(K))
diff --git a/mmap.h b/mmap.h
index 3559f51a3..87b9e7c64 100644
--- a/mmap.h
+++ b/mmap.h
@@ -17,7 +17,7 @@
 #include <stdlib.h>
 #include <sys/stat.h>
 
-#if defined(_MSC_VER) || defined(__MINGW32__)
+#if defined(_MSC_VER) || defined(__MINGW32__) && !(defined (_POSIX_MAPPED_FILES))
 #ifndef __MINGW32__
 #include <Windows.h>
 #else