diff --git a/build/appveyor/build-zlib.bat b/build/appveyor/build-zlib.bat
new file mode 100644
index 0000000..d8811a1
--- /dev/null
+++ b/build/appveyor/build-zlib.bat
@@ -0,0 +1,49 @@
+::
+:: Licensed under the Apache License, Version 2.0 (the "License");
+:: you may not use this file except in compliance with the License.
+:: You may obtain a copy of the License at
+::
+::     http://www.apache.org/licenses/LICENSE-2.0
+::
+:: Unless required by applicable law or agreed to in writing, software
+:: distributed under the License is distributed on an "AS IS" BASIS,
+:: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+:: See the License for the specific language governing permissions and
+:: limitations under the License.
+::
+
+SETLOCAL EnableDelayedExpansion
+
+SET PACKAGE=zlib-%ZLIB_VERSION%
+SET BUILDDIR=%WIN3P%\zlib-build
+SET INSTDIR=%WIN3P%\zlib-inst
+SET SRCDIR=%WIN3P%\%PACKAGE%
+SET URLFILE=%PACKAGE%.tar.gz
+
+:: This allows us to tolerate when the current version is archived
+SET URL=http://zlib.net/%URLFILE%
+SET FURL=http://zlib.net/fossils/%URLFILE%
+
+:: Download
+CD "%WIN3P%"                                                     || EXIT /B
+appveyor DownloadFile "%URL%"
+IF ERRORLEVEL 1 (
+    appveyor DownloadFile "%FURL%"                               || EXIT /B
+)
+7z x "%URLFILE%" -so | 7z x -si -ttar > nul                      || EXIT /B
+
+:: Generate
+MKDIR "%BUILDDIR%"                                               || EXIT /B
+CD "%BUILDDIR%"                                                  || EXIT /B
+cmake "%SRCDIR%" ^
+      -G"NMake Makefiles" ^
+      -DCMAKE_INSTALL_PREFIX="%INSTDIR%" ^
+      -DCMAKE_BUILD_TYPE="%CONFIGURATION%"                       || EXIT /B
+
+:: Build
+nmake /fMakefile install                                         || EXIT /B
+IF "%CONFIGURATION%" == "Debug" (
+    COPY "%BUILDDIR%\zlibd.pdb" "%INSTDIR%\bin\"                 || EXIT /B
+)
+
+ENDLOCAL