diff --git a/src/compat/posix.h b/src/compat/posix.h
index 4468f63..c3d94a5 100644
--- a/src/compat/posix.h
+++ b/src/compat/posix.h
@@ -41,8 +41,18 @@
 #  define TMP_POSIX
 # endif
 # if defined(__MINGW32__) || defined(__MINGW64__)
-#  define off_t _off_t
-#  define off64_t _off64_t
+
+# include <stdint.h>
+
+typedef int32_t cr_off32
+typedef int64_t cr_off64
+
+#  if !defined(__MINGW64__)
+#   define off_t cr_off32
+#  else
+#   define off_t cr_off64
+#  endif
+#  define off64_t cr_off64
 # endif
 # include <stdio.h>
 # include <string.h>