diff --git a/third_party/zlib/gzguts.h b/third_party/zlib/gzguts.h
index 990a4d25149337..8e2d660da90bae 100644
--- a/third_party/zlib/gzguts.h
+++ b/third_party/zlib/gzguts.h
@@ -3,6 +3,10 @@
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
+#ifndef _WIN32
+  #include <unistd.h>
+#endif
+
 #ifdef _LARGEFILE64_SOURCE
 #  ifndef _LARGEFILE_SOURCE
 #    define _LARGEFILE_SOURCE 1
diff --git a/third_party/zlib/zlib.patch b/third_party/zlib/zlib.patch
new file mode 100644
index 00000000000000..7181d44aa9f9b1
--- /dev/null
+++ b/third_party/zlib/zlib.patch
@@ -0,0 +1,15 @@
+diff --git a/third_party/zlib/gzguts.h b/third_party/zlib/gzguts.h
+index 57faf37165..54f668fcb2 100644
+--- a/third_party/zlib/gzguts.h
++++ b/third_party/zlib/gzguts.h
+@@ -3,6 +3,10 @@
+  * For conditions of distribution and use, see copyright notice in zlib.h
+  */
+ 
++#ifndef _WIN32
++  #include <unistd.h>
++#endif
++
+ #ifdef _LARGEFILE64_SOURCE
+ #  ifndef _LARGEFILE_SOURCE
+ #    define _LARGEFILE_SOURCE 1