diff --git a/src/terminal.tsx b/src/terminal.tsx
index f8d21f0..e198197 100644
--- a/src/terminal.tsx
+++ b/src/terminal.tsx
@@ -56,7 +56,7 @@ function TerminalComponent (p: {websocket: string|null}) {
             });
 
             terminal.current.onResize(({cols, rows})=>{
-              socket.send(JSON.stringify({CommandType: 'resize', Arguments: [rows, cols]}));
+              socket.send(JSON.stringify({CommandType: 'resize', Arguments: [String(rows), String(cols)]}));
             })
 
             socket.addEventListener('message', (event) => {