diff --git a/dial.go b/dial.go
index 7a7787ff..74f2e2eb 100644
--- a/dial.go
+++ b/dial.go
@@ -253,6 +253,8 @@ func verifyServerExtensions(copts *compressionOptions, h http.Header) (*compress
 		case "server_no_context_takeover":
 			copts.serverNoContextTakeover = true
 			continue
+		case "server_max_window_bits=15":
+			continue
 		}
 
 		return nil, fmt.Errorf("unsupported permessage-deflate parameter: %q", p)