diff --git a/rpc/websocket.go b/rpc/websocket.go
index a6e1cec28a..5fe9867c59 100644
--- a/rpc/websocket.go
+++ b/rpc/websocket.go
@@ -107,7 +107,7 @@ func wsHandshakeValidator(allowedOrigins []string) func(*websocket.Config, *http
 	log.Debug(fmt.Sprintf("Allowed origin(s) for WS RPC interface %v\n", origins.List()))
 
 	f := func(cfg *websocket.Config, req *http.Request) error {
-		origin := strings.ToLower(req.Header.Get("Origin"))
+		origin := strings.ToLower(req.Header.Get("origin"))
 		if allowAllOrigins || origins.Has(origin) {
 			return nil
 		}