diff --git a/ChangeLog b/ChangeLog
index 8d4cd21f15..e3dec4fec6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Mar 25 10:53:16 2005  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* configure.in (WIN32_LEAN_AND_MEAN): removed because a lot of
+	  troubles.
+
 Thu Mar 24 23:10:44 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (macro_defined?): try to compile for an old compiler
diff --git a/configure.in b/configure.in
index d0efd7feb4..cedfe6795e 100644
--- a/configure.in
+++ b/configure.in
@@ -1306,7 +1306,7 @@ case "$target_os" in
 	    fi
 	    AC_LIBOBJ([win32])
 	    COMMON_LIBS=m
-	    COMMON_MACROS="WIN32_LEAN_AND_MEAN="
+#	    COMMON_MACROS="WIN32_LEAN_AND_MEAN="
 	    COMMON_HEADERS="windows.h winsock.h"
 	    ;;
 	esac