diff --git a/frame.go b/frame.go
index e223fca..c4a1167 100644
--- a/frame.go
+++ b/frame.go
@@ -358,9 +358,9 @@ func (fr *Frame) setLength(n int) {
 
 // Mask performs the masking of the current payload
 func (fr *Frame) Mask() {
+	fr.op[1] |= maskBit
+	readMask(fr.mask)
 	if len(fr.b) > 0 {
-		fr.op[1] |= maskBit
-		readMask(fr.mask)
 		mask(fr.mask, fr.b)
 	}
 }
diff --git a/go.mod b/go.mod
index affe480..2cd33cd 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,9 @@ module github.com/dgrr/fastws
 
 go 1.14
 
-require github.com/valyala/fasthttp v1.12.0
+require (
+	github.com/gobwas/ws v1.0.4
+	github.com/gorilla/websocket v1.4.2
+	github.com/valyala/fasthttp v1.12.0
+	nhooyr.io/websocket v1.8.6
+)