diff --git a/platformLibs/src/platform/mingw/posix.def b/platformLibs/src/platform/mingw/posix.def
index d2895122a16..46ff5f2d1d9 100644
--- a/platformLibs/src/platform/mingw/posix.def
+++ b/platformLibs/src/platform/mingw/posix.def
@@ -5,6 +5,7 @@ headers = assert.h complex.h ctype.h dirent.h errno.h fcntl.h \
     setjmp.h signal.h stdint.h stdio.h stdlib.h string.h \
     time.h uchar.h unistd.h utime.h wchar.h wctype.h
 noStringConversion = send sendto recv
+compilerOpts = -DUNICODE -DWINVER=0x0601 -D_WIN32_WINNT=0x0601 -DWINAPI_FAMILY=3 -DOEMRESOURCE -D_POSIX_C_SOURCE=1
 linkerOpts = -lWs2_32
 
 ---