diff --git a/ChangeLog b/ChangeLog
index dac2ec03a2..d061059cfe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jan 24 15:09:40 2008  Tanaka Akira  <akr@fsij.org>
+
+	* time.c (make_time_t): revert round trip test.  [ruby-dev:33058]
+
 Thu Jan 24 11:14:56 2008  Tanaka Akira  <akr@fsij.org>
 
 	* string.c (rb_enc_cr_str_buf_cat): ASCII incompatible encoding is
diff --git a/time.c b/time.c
index 59d36088a3..2b00a538be 100644
--- a/time.c
+++ b/time.c
@@ -825,37 +825,40 @@ make_time_t(struct tm *tptr, int utc_p)
     buf = *tptr;
     if (utc_p) {
 #if defined(HAVE_TIMEGM)
-	t = timegm(&buf);
-        if (t == (time_t)-1)
-#endif
-	t = search_time_t(&buf, utc_p);
+	if ((t = timegm(&buf)) != -1)
+	    return t;
+#ifdef NEGATIVE_TIME_T
 	if ((tmp = gmtime(&t)) &&
 	    tptr->tm_year == tmp->tm_year &&
 	    tptr->tm_mon == tmp->tm_mon &&
 	    tptr->tm_mday == tmp->tm_mday &&
 	    tptr->tm_hour == tmp->tm_hour &&
 	    tptr->tm_min == tmp->tm_min &&
-	    tptr->tm_sec == tmp->tm_sec) {
+	    tptr->tm_sec == tmp->tm_sec
+	)
 	    return t;
-        }
+#endif
+#endif
+	return search_time_t(&buf, utc_p);
     }
     else {
 #if defined(HAVE_MKTIME)
-	t = mktime(&buf);
-        if (t == (time_t)-1)
-#endif
-	t = search_time_t(&buf, utc_p);
+	if ((t = mktime(&buf)) != -1)
+	    return t;
+#ifdef NEGATIVE_TIME_T
 	if ((tmp = localtime(&t)) &&
 	    tptr->tm_year == tmp->tm_year &&
 	    tptr->tm_mon == tmp->tm_mon &&
 	    tptr->tm_mday == tmp->tm_mday &&
 	    tptr->tm_hour == tmp->tm_hour &&
 	    tptr->tm_min == tmp->tm_min &&
-	    tptr->tm_sec == tmp->tm_sec) {
+	    tptr->tm_sec == tmp->tm_sec
+	)
             return t;
-        }
+#endif
+#endif
+	return search_time_t(&buf, utc_p);
     }
-    rb_raise(rb_eArgError, "couldn't generate a time");
 }
 
 static VALUE