diff --git a/src/PSON/Pair.ts b/src/PSON/Pair.ts
index 9f3d6eb..4cd4050 100644
--- a/src/PSON/Pair.ts
+++ b/src/PSON/Pair.ts
@@ -10,8 +10,8 @@ import * as ByteBuffer from "bytebuffer";
  * @abstract
  */
 export abstract class Pair {
-	protected encoder: Encoder;
-	protected decoder: Decoder;
+	protected encoder!: Encoder;
+	protected decoder!: Decoder;
 
 	/**
 	 * Encodes JSON to PSON.