diff --git a/win32/libssh2_config.h b/win32/libssh2_config.h
index 56c64a6a..39e438f9 100644
--- a/win32/libssh2_config.h
+++ b/win32/libssh2_config.h
@@ -34,9 +34,6 @@
 #define strcasecmp stricmp
 #endif /* _MSC_VER */
 
-/* Compile in zlib support */
-#define LIBSSH2_HAVE_ZLIB 1
-
 /* Enable newer diffie-hellman-group-exchange-sha1 syntax */
 #define LIBSSH2_DH_GEX_NEW 1