diff --git a/src/mcp23008-17.js b/src/mcp23008-17.js
index 4632008..96a8d40 100644
--- a/src/mcp23008-17.js
+++ b/src/mcp23008-17.js
@@ -209,7 +209,7 @@ class MCP23008 extends aggregate(Device, EventEmitter) {
 
 	async allToggle(port = 'A') {
 		let pins = 255
-		await this.writePort('toggle', port)
+		await this.writePort(pins, 'toggle', port)
 	}
 
 	async force(pins, port, format) {