diff --git a/ChangeLog b/ChangeLog
index 3582837dbe..762235eef5 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Apr  3 22:47:51 2010  Tanaka Akira  <akr@fsij.org>
+
+	* time.c: don't define STRUCT_WIDEVAL.
+
 Sat Apr  3 18:15:02 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/rdoc/rdoc.rb (RDoc#{setup,update}_output_dir): store mtimes
diff --git a/time.c b/time.c
index e36c33bdcb..5d310508fb 100644
--- a/time.c
+++ b/time.c
@@ -243,7 +243,6 @@ divmodv(VALUE n, VALUE d, VALUE *q, VALUE *r)
 #define FIXWV_P(w) FIXWINT_P(WIDEVAL_GET(w))
 
 /* #define STRUCT_WIDEVAL */
-#define STRUCT_WIDEVAL
 #ifdef STRUCT_WIDEVAL
     /* for type checking */
     typedef struct {