diff --git a/ChangeLog b/ChangeLog
index 5bd9b4ddcb..bcd5d9c1f1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov  5 23:58:32 2016  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* numeric.c (rb_int_round): cast to SIGNED_VALUE to suppress
+	  warnings by -Wsign-compare.
+
 Sat Nov  5 23:48:27 2016  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* file.c (rb_home_dir_of): convert given username into filesystem
diff --git a/numeric.c b/numeric.c
index 4881f75217..e7a98566c0 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2075,7 +2075,7 @@ rb_int_round(VALUE num, int ndigits, enum ruby_num_rounding_mode mode)
 	(FIXNUM_ZERO_P(r) &&
 	 ROUND_TO(mode,
 		  int_pos_p(num),
-		  int_odd_p(rb_int_idiv(n, f))))) {
+		  (SIGNED_VALUE) int_odd_p(rb_int_idiv(n, f))))) {
 	n = rb_int_plus(n, f);
     }
     return n;