diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4124c0a..96e093c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -53,6 +53,10 @@ if (WIN32 AND NOT MSVC)
   set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-no-undefined")
 endif()
 
+# Compilation options
+
+option(MINGW_DEFINE_OFF_T "Define off_t and off64_t ourselves before including io.h" OFF)
+
 # Setup coveralls
 
 option(COVERALLS "Turn on coveralls support" OFF)
diff --git a/src/compat/internal.h b/src/compat/internal.h
index d1c342c..deb41bc 100644
--- a/src/compat/internal.h
+++ b/src/compat/internal.h
@@ -31,21 +31,18 @@
 #  define _WIN32_WINNT 0x0502
 #  include <windows.h>
 
-#  if defined(__MINGW32__) || defined(__MINGW64__)
+#  if defined(MINGW_DEFINE_OFF_T) && (defined(__MINGW32__) || defined(__MINGW64__))
+#   include "off_t.h"
 
-#   if defined(__STRICT_ANSI__) || defined(MINGW_DEFINE_OFF_T)
-#    include "off_t.h"
-
-#    if !defined(__MINGW64__)
-#     define off_t cr_off32
-#    else
-#     define off_t cr_off64
-#    endif
-#    define off64_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 <io.h>
-#  if defined(__MINGW32__) || defined(__MINGW64__)
+#  if defined(MINGW_DEFINE_OFF_T) && (defined(__MINGW32__) || defined(__MINGW64__))
 #   undef off_t
 #   undef off64_t
 #  endif
diff --git a/src/compat/posix.h b/src/compat/posix.h
index 0a7bbda..1081942 100644
--- a/src/compat/posix.h
+++ b/src/compat/posix.h
@@ -40,22 +40,19 @@
 #  define _POSIX_SOURCE 1
 #  define TMP_POSIX
 # endif
-# if defined(__MINGW32__) || defined(__MINGW64__)
+# if defined(MINGW_DEFINE_OFF_T) && (defined(__MINGW32__) || defined(__MINGW64__))
+#  include "off_t.h"
 
-#  if defined(__STRICT_ANSI__) || defined(MINGW_DEFINE_OFF_T)
-#   include "off_t.h"
-
-#   if !defined(__MINGW64__)
-#    define off_t cr_off32
-#   else
-#    define off_t cr_off64
-#   endif
-#   define off64_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>
-# if defined(__MINGW32__) || defined(__MINGW64__)
+# if defined(MINGW_DEFINE_OFF_T) && defined(__MINGW32__) || defined(__MINGW64__)
 #  undef off_t
 #  undef off64_t
 # endif
diff --git a/src/config.h.in b/src/config.h.in
index 6455bff..43f7058 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -5,6 +5,7 @@
 #cmakedefine HAVE_PCRE @HAVE_PCRE@
 #cmakedefine ENABLE_VALGRIND_ERRORS @ENABLE_VALGRIND_ERRORS@
 #cmakedefine01 HAVE_STRTOK_S
+#cmakedefine01 MINGW_DEFINE_OFF_T
 
 # define LOCALEDIR "${LOCALEDIR}"
 # define PACKAGE "${PROJECT_NAME}"