diff --git a/ChangeLog b/ChangeLog
index 9f15c24807..e6dfde2960 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue Mar 29 15:27:14 2016  Rei Odaira  <Rei.Odaira@gmail.com>
+
+	* test/zlib/test_zlib.rb (test_adler32_combine, test_crc32_combine):
+	  Skip two tests on AIX because zconf.h in zlib does not correctly
+	  recognize _LARGE_FILES in AIX. The problem was already reported
+	  to zlib, and skip these tests until it is fixed.
+
 Tue Mar 29 15:10:31 2016  Rei Odaira  <Rei.Odaira@gmail.com>
 
 	* thread_pthread.c (getstack): __pi_stacksize returned by
diff --git a/test/zlib/test_zlib.rb b/test/zlib/test_zlib.rb
index 37d4b69b0a..0092daf0d9 100644
--- a/test/zlib/test_zlib.rb
+++ b/test/zlib/test_zlib.rb
@@ -1070,6 +1070,11 @@ if defined? Zlib
         assert_equal(0x02820145, Zlib.adler32_combine(one, two, 1))
       rescue NotImplementedError
         skip "adler32_combine is not implemented"
+      rescue Minitest::Assertion
+        if /aix/ =~ RUBY_PLATFORM
+          skip "zconf.h in zlib does not handle _LARGE_FILES in AIX. Skip until it is fixed"
+        end
+        raise $!
       end
     end
 
@@ -1087,6 +1092,11 @@ if defined? Zlib
         assert_equal(0x8c736521, Zlib.crc32_combine(one, two, 1))
       rescue NotImplementedError
         skip "crc32_combine is not implemented"
+      rescue Minitest::Assertion
+        if /aix/ =~ RUBY_PLATFORM
+          skip "zconf.h in zlib does not handle _LARGE_FILES in AIX. Skip until it is fixed"
+        end
+        raise $!
       end
     end
 
diff --git a/version.h b/version.h
index 192cd5987c..1ac6b8c9a2 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@
 #define RUBY_VERSION "2.3.0"
 #define RUBY_RELEASE_DATE "2016-03-29"
-#define RUBY_PATCHLEVEL 29
+#define RUBY_PATCHLEVEL 30
 
 #define RUBY_RELEASE_YEAR 2016
 #define RUBY_RELEASE_MONTH 3