diff --git a/ChangeLog b/ChangeLog
index ecd1137cff..41db5cfffc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Sep  5 02:17:06 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (rb_big_divrem_normal): Add GC guards.
+
 Thu Sep  5 00:38:32 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (rb_big_divrem_normal): New function.
diff --git a/bignum.c b/bignum.c
index 6092376061..b09080d4ee 100644
--- a/bignum.c
+++ b/bignum.c
@@ -2725,6 +2725,9 @@ rb_big_divrem_normal(VALUE x, VALUE y)
     bigtrunc(q);
     bigtrunc(r);
 
+    RB_GC_GUARD(x);
+    RB_GC_GUARD(y);
+
     return rb_assoc_new(q, r);
 }