diff --git a/src/plat.h b/src/plat.h
index aa5c47e..e59ffe8 100644
--- a/src/plat.h
+++ b/src/plat.h
@@ -65,6 +65,11 @@
 # define fseeko64       fseeko
 # define ftello64       ftello
 # define off64_t        off_t
+#elif defined(_MSC_VER)
+# define fopen64        fopen
+# define fseeko64       _fseeki64
+# define ftello64       _ftelli64
+# define off64_t        off_t
 #endif