diff --git a/src/signed-xml.ts b/src/signed-xml.ts
index 2fb3a7f..ca19db7 100644
--- a/src/signed-xml.ts
+++ b/src/signed-xml.ts
@@ -275,7 +275,7 @@ export class SignedXml {
 
       if (verified === false) {
         throw new Error(
-          "invalid signature: the signature value ${this.signatureValue} is incorrect",
+          `invalid signature: the signature value ${this.signatureValue} is incorrect`,
         );
       }