diff --git a/src/KnxProtocol.ts b/src/KnxProtocol.ts
index e6f3b86..4860b11 100644
--- a/src/KnxProtocol.ts
+++ b/src/KnxProtocol.ts
@@ -52,7 +52,7 @@ KnxProtocol.define('IPv4Endpoint', {
 			)
 
 		const [addr, port] = value.split(':')
-		this.raw(Buffer.from(ipaddr.parse(addr).toByteArray()), 4)
+		this.raw(Buffer.from(ipaddr.parse(addr).toByteArray()))
 		this.UInt16BE(port)
 	},
 })
diff --git a/src/types/binary-protocol.d.ts b/src/types/binary-protocol.d.ts
index d170d25..cd49d40 100644
--- a/src/types/binary-protocol.d.ts
+++ b/src/types/binary-protocol.d.ts
@@ -2,8 +2,8 @@ import { Duplex } from 'stream'
 
 declare module 'binary-protocol' {
 	interface ProtocolConfig {
-		read(propertyName: string): void
-		write(value: any): void
+		read(this: Reader, propertyName: string): void
+		write(this: Writer, value: any): void
 	}
 
 	interface Reader {
@@ -20,7 +20,7 @@ declare module 'binary-protocol' {
 		end(fn: () => void): this
 		finally(fn: () => void): this
 		reset(): this
-		raw(property: string, fn: (value: any) => void): this
+		raw(property: string, length: number): this
 		next(chunk?: any): any
 		process(): any
 		createLooper(property: string, fn: (value: any) => void): this