diff --git a/tile.cc b/tile.cc
index cb0bcab..7646dd0 100644
--- a/tile.cc
+++ b/tile.cc
@@ -35,7 +35,7 @@ static inline int compress(std::string const& input, std::string& output) {
 	deflate_s.opaque = Z_NULL;
 	deflate_s.avail_in = 0;
 	deflate_s.next_in = Z_NULL;
-	deflateInit(&deflate_s, Z_DEFAULT_COMPRESSION);
+	deflateInit2(&deflate_s, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY);
 	deflate_s.next_in = (Bytef *)input.data();
 	deflate_s.avail_in = input.size();
 	size_t length = 0;