diff --git a/.eslintrc.json b/.eslintrc.json
index c409610e..18ed0784 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -31,6 +31,6 @@
     "deprecation/deprecation": "warn",
     "@typescript-eslint/no-non-null-assertion": "error",
     "@typescript-eslint/no-unused-vars": "warn",
-    "@typescript-eslint/no-this-alias": "warn"
+    "@typescript-eslint/no-this-alias": "error"
   }
 }
diff --git a/src/signed-xml.ts b/src/signed-xml.ts
index 072201ff..13bf3d08 100644
--- a/src/signed-xml.ts
+++ b/src/signed-xml.ts
@@ -821,21 +821,20 @@ export class SignedXml {
     const signedInfoNode = signedInfoNodes[0];
 
     if (typeof callback === "function") {
-      const self = this;
-      //Asynchronous flow
-      this.calculateSignatureValue(doc, function (err, signature) {
+      // Asynchronous flow
+      this.calculateSignatureValue(doc, (err, signature) => {
         if (err) {
           callback(err);
         } else {
-          self.signatureValue = signature || "";
-          signatureDoc.insertBefore(self.createSignature(prefix), signedInfoNode.nextSibling);
-          self.signatureXml = signatureDoc.toString();
-          self.signedXml = doc.toString();
-          callback(null, self);
+          this.signatureValue = signature || "";
+          signatureDoc.insertBefore(this.createSignature(prefix), signedInfoNode.nextSibling);
+          this.signatureXml = signatureDoc.toString();
+          this.signedXml = doc.toString();
+          callback(null, this);
         }
       });
     } else {
-      //Synchronous flow
+      // Synchronous flow
       this.calculateSignatureValue(doc);
       signatureDoc.insertBefore(this.createSignature(prefix), signedInfoNode.nextSibling);
       this.signatureXml = signatureDoc.toString();