diff --git a/configure b/configure
index 837b9943ad..9da847d80f 100755
--- a/configure
+++ b/configure
@@ -6261,13 +6261,11 @@ fi
 _libavformat=no
 _def_libavformat='#undef USE_LIBAVFORMAT'
 _def_libavformat_so='#undef USE_LIBAVFORMAT_SO'
-_def_libavformat_win32='#undef CONFIG_WIN32'
 test "$_libavformat_a" = yes || test "$_libavformat_so" = yes && _libavformat=yes
 test "$_libavformat_a"  = yes && _def_libavformat='#define USE_LIBAVFORMAT 1'
 test "$_libavformat_so" = yes \
   && _def_libavformat_so='#define USE_LIBAVFORMAT_SO 1'
 fi
-win32 && _def_libavformat_win32='#define CONFIG_WIN32 1'
 echores "$_libavformat"
 
 echocheck "FFmpeg libpostproc"
@@ -8093,7 +8091,6 @@ $_def_libavcodec_mpegaudio_hp
 /* ffmpeg's libavformat support (requires libavformat source) */
 $_def_libavformat
 $_def_libavformat_so
-$_def_libavformat_win32
 
 $_def_libavutil
 $_def_libavutil_so