diff --git a/src/compression.c b/src/compression.c
index 87449ac..45244a0 100644
--- a/src/compression.c
+++ b/src/compression.c
@@ -317,7 +317,7 @@
 	strm->zfree = Z_NULL;
 	strm->opaque = Z_NULL;
 
-	if (deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS + 16, 9, Z_DEFAULT_STRATEGY) != Z_OK)
+	if (deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS + 16, 8, Z_DEFAULT_STRATEGY) != Z_OK)
 		return -1;
 
 	return 0;