diff --git a/server/websocket.go b/server/websocket.go
index 67fd8074..7b10877d 100644
--- a/server/websocket.go
+++ b/server/websocket.go
@@ -529,7 +529,7 @@ func (s *Server) wsUpgrade(w http.ResponseWriter, r *http.Request) (*wsUpgradeRe
 	}
 	// Point 3.
 	if !wsHeaderContains(r.Header, "Upgrade", "websocket") {
-		return nil, wsReturnHTTPError(w, http.StatusBadRequest, "invalid value for header 'Uprade'")
+		return nil, wsReturnHTTPError(w, http.StatusBadRequest, "invalid value for header 'Upgrade'")
 	}
 	// Point 4.
 	if !wsHeaderContains(r.Header, "Connection", "Upgrade") {
diff --git a/server/websocket_test.go b/server/websocket_test.go
index 1b03a72d..fa5e235b 100644
--- a/server/websocket_test.go
+++ b/server/websocket_test.go
@@ -1107,7 +1107,7 @@ func TestWSUpgradeValidationErrors(t *testing.T) {
 				req.Header.Del("Upgrade")
 				return opts, nil, req
 			},
-			"invalid value for header 'Uprade'",
+			"invalid value for header 'Upgrade'",
 			http.StatusBadRequest,
 		},
 		{