diff --git a/ares/Makefile.m32 b/ares/Makefile.m32
index 051b1353e..8758d4e0c 100644
--- a/ares/Makefile.m32
+++ b/ares/Makefile.m32
@@ -19,9 +19,9 @@ LIB=libcares.a
 CC=gcc
 #CPPFLAGS=@CPPFLAGS@
 WARN_FLAGS=-Wall
-CFLAGS=-O2 -DMINGW32
+CFLAGS=-O2
 CFLAGS+=${WARN_CFLAGS} ${ERROR_CFLAGS}
-#DEFS=-DWIN32
+DEFS=-DMINGW32
 LDFLAGS=-s
 LIBS=-lwsock32
 ALL_CFLAGS=${CPPFLAGS} ${CFLAGS} ${DEFS}