diff --git a/ChangeLog b/ChangeLog
index 46e0cee096..01b73c178a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,11 +3,6 @@ Sat Feb  6 22:30:57 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 	* lib/cgi/util.rb (escapeHTML, unescapeHTML): consider
 	  ASCII-incompatible encodings.  [Fix GH-1239]
 
-Sat Feb  6 20:44:24 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
-
-	* configure.in: check __int64_t and __int128_t for RUBY_DEFINT on
-	  OS X.
-
 Sat Feb  6 15:18:28 2016  Martin Duerst  <duerst@it.aoyama.ac.jp>
 
 	* test/ruby/enc/test_regex_casefold.rb: Added data-based testing for
diff --git a/configure.in b/configure.in
index 1cb1ef6cb6..040484b5ab 100644
--- a/configure.in
+++ b/configure.in
@@ -1473,8 +1473,6 @@ RUBY_CHECK_SIZEOF(long, [int], [ILP LP])
 RUBY_CHECK_SIZEOF(long long)
 RUBY_CHECK_SIZEOF(__int64)
 RUBY_CHECK_SIZEOF(__int128)
-RUBY_CHECK_SIZEOF(__int64_t)
-RUBY_CHECK_SIZEOF(__int128_t)
 RUBY_CHECK_SIZEOF(off_t)
 RUBY_CHECK_SIZEOF(void*, [int long "long long"], [ILP LP LLP])
 RUBY_CHECK_SIZEOF(float)
@@ -2011,8 +2009,6 @@ typedef $1 t; int s = sizeof(t) == 42;])],
     ["$ac_cv_sizeof_long_long"], [ rb_cv_type_$1="m4_if([$3], [], [], [$3 ])long long"],
     ["$ac_cv_sizeof___int64"], [ rb_cv_type_$1="m4_if([$3], [], [], [$3 ])__int64"],
     ["$ac_cv_sizeof___int128"], [ rb_cv_type_$1="m4_if([$3], [], [], [$3 ])__int128"],
-    ["$ac_cv_sizeof___int64_t"], [ rb_cv_type_$1="m4_if([$3], [], [], [$3 ])__int64_t"],
-    ["$ac_cv_sizeof___int128_t"], [ rb_cv_type_$1="m4_if([$3], [], [], [$3 ])__int128_t"],
     [ rb_cv_type_$1=no])])])
 if test "${rb_cv_type_$1}" != no; then
     AC_DEFINE([HAVE_]AS_TR_CPP($1), 1)