diff --git a/ChangeLog b/ChangeLog
index 75bc93fb92..2d6d1ecb75 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Feb 25 11:46:58 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* win32/Makefile.sub: enable -Zi (debug) option.
+
 Sun Feb 25 11:38:40 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* ruby.h: define RUBY_VM macro and remove NATIVETHREAD* macros.
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 4c90898788..49f6a7d854 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -75,7 +75,7 @@ ARCH = i386
 CPU = $(PROCESSOR_ARCHITECTURE)
 ARCH = $(PROCESSOR_ARCHITECTURE)
 !endif
-!if !defined(DEBUGFLAGS) && $(MSC_VER) < 1400
+!if !defined(DEBUGFLAGS)
 DEBUGFLAGS = -Zi
 !endif
 !if !defined(OPTFLAGS)