diff --git a/ChangeLog b/ChangeLog
index 7463660f63..5889d82993 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Mar 29 10:16:05 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* thread_win32.c (TIME_QUANTUM_USEC): 10ms(= old setting) [experimental]
+	  cf. [Bug #6098]
+
 Thu Mar 29 10:12:12 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* thread.c (rb_threadptr_execute_interrupts_common): use defined
diff --git a/thread_win32.c b/thread_win32.c
index da971e70de..3fd844018e 100644
--- a/thread_win32.c
+++ b/thread_win32.c
@@ -13,7 +13,7 @@
 
 #include <process.h>
 
-#define TIME_QUANTUM_USEC (100 * 1000)
+#define TIME_QUANTUM_USEC (10 * 1000)
 #define RB_CONDATTR_CLOCK_MONOTONIC 1 /* no effect */
 
 #undef Sleep