diff --git a/src/compat/internal.h b/src/compat/internal.h
index 551212b..5a04bdc 100644
--- a/src/compat/internal.h
+++ b/src/compat/internal.h
@@ -30,9 +30,19 @@
 #  undef _WIN32_WINNT
 #  define _WIN32_WINNT 0x0502
 #  include <windows.h>
+
+#  include <stdint.h>
+
+typedef int32_t cr_off32
+typedef int64_t cr_off64
+
 #  if defined(__MINGW32__) || defined(__MINGW64__)
-#   define off_t _off_t
-#   define off64_t _off64_t
+#   if !defined(__MINGW64__)
+#    define off_t cr_off32
+#   else
+#    define off_t cr_off64
+#   endif
+#   define off64_t cr_off64
 #  endif
 #  include <io.h>
 #  if defined(__MINGW32__) || defined(__MINGW64__)