diff --git a/.gitignore b/.gitignore
index fe7c04823b4eab..b7a6f66dc5f649 100644
--- a/.gitignore
+++ b/.gitignore
@@ -196,6 +196,9 @@ lcov*.info
 /ext/socket/constdefs.h
 /ext/socket/constdefs.c
 
+# /ext/zlib/
+/ext/zlib/zlib-*
+
 # /gems
 /gems/*.gem
 /gems/src
diff --git a/appveyor.yml b/appveyor.yml
index 28ca917e8eadd0..5da810c4c19473 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -54,15 +54,13 @@ for:
     - mkdir \usr\local\bin
     - mkdir \usr\local\include
     - mkdir \usr\local\lib
-    - curl -fsSL -o zlib%zlib_version:.=%.zip --retry 10 https://zlib.net/zlib%zlib_version:.=%.zip
-    - 7z x -o%APPVEYOR_BUILD_FOLDER%\ext\zlib zlib%zlib_version:.=%.zip
     - for %%I in (%OPENSSL_DIR%\*.dll) do mklink /h \usr\local\bin\%%~nxI %%I
     - attrib +r /s /d
     - mkdir %Platform%-mswin_%vs%
   build_script:
     - cd %APPVEYOR_BUILD_FOLDER%
     - cd %Platform%-mswin_%vs%
-    - ..\win32\configure.bat --without-ext=+,dbm,gdbm,readline --with-opt-dir=/usr/local --with-openssl-dir=%OPENSSL_DIR:\=/%
+    - ..\win32\configure.bat --without-ext=+,dbm,gdbm,readline --with-opt-dir=/usr/local --enable-bundled-zlib --with-openssl-dir=%OPENSSL_DIR:\=/%
     - nmake -l
     - nmake install-nodoc
     - \usr\bin\ruby -v -e "p :locale => Encoding.find('locale'), :filesystem => Encoding.find('filesystem')"
diff --git a/ext/zlib/extlibs b/ext/zlib/extlibs
new file mode 100644
index 00000000000000..246a3d12cc9e82
--- /dev/null
+++ b/ext/zlib/extlibs
@@ -0,0 +1,3 @@
+http://www.zlib.net/zlib-1.2.11.tar.gz \
+  md5:1c9f62f0778697a09d36121ead88e08e \
+  sha512:73fd3fff4adeccd4894084c15ddac89890cd10ef105dd5e1835e1e9bbb6a49ff229713bd197d203edfa17c2727700fce65a2a235f07568212d820dca88b528ae