matz

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1068 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/time.c b/time.c
index 2ef06eb6f7..e45e2e854a 100644
--- a/time.c
+++ b/time.c
@@ -696,6 +696,10 @@ time_minus(time1, time2)
 	sec = tobj->tv.tv_sec - sec;
     }
 
+    if (usec >= 1000000) {	/* usec overflow */
+	sec++;
+	usec -= 1000000;
+    }
     if (usec < 0) {		/* usec underflow */
 	sec--;
 	usec += 1000000;