diff --git a/packages/siwe-parser/lib/abnf.ts b/packages/siwe-parser/lib/abnf.ts
index a7e5fcfa..34531d6e 100644
--- a/packages/siwe-parser/lib/abnf.ts
+++ b/packages/siwe-parser/lib/abnf.ts
@@ -175,7 +175,7 @@ export class ParsedMessage {
 	requestId: string | null;
 	resources: Array<string> | null;
 
-	constructor(msg: string) {
+	constructor(msg: string, parserOptions = { validateEIP55Address: true }) {
 		const parser = new apgLib.parser();
 		parser.ast = new apgLib.ast();
 		const id = apgLib.ids;
@@ -359,7 +359,7 @@ export class ParsedMessage {
 			throw new Error("Domain cannot be empty.");
 		}
 
-		if (!isEIP55Address(this.address)) {
+		if (parserOptions.validateEIP55Address && !isEIP55Address(this.address)) {
 			throw new Error("Address not conformant to EIP-55.");
 		}
 	}
diff --git a/packages/siwe/lib/client.ts b/packages/siwe/lib/client.ts
index bf3b9fac..61f86b26 100644
--- a/packages/siwe/lib/client.ts
+++ b/packages/siwe/lib/client.ts
@@ -10,6 +10,7 @@ import { getAddress, Provider, verifyMessage } from './ethersCompat';
 import {
   SiweError,
   SiweErrorType,
+  SiweMessageConstructorOptions,
   SiweResponse,
   VerifyOpts,
   VerifyOptsKeys,
@@ -61,15 +62,24 @@ export class SiweMessage {
    * expressed as RFC 3986 URIs separated by `\n- `. */
   resources?: Array<string>;
 
+  /** If the library should validate the address against EIP-55, defaults to true */
+  validateEIP55Address = true;
+
   /**
    * Creates a parsed Sign-In with Ethereum Message (EIP-4361) object from a
    * string or an object. If a string is used an ABNF parser is called to
    * validate the parameter, otherwise the fields are attributed.
    * @param param {string | SiweMessage} Sign message as a string or an object.
    */
-  constructor(param: string | Partial<SiweMessage>) {
+  constructor(param: string | Partial<SiweMessage>, options?: SiweMessageConstructorOptions) {
+    if(options.validateEIP55Address !== undefined){
+      this.validateEIP55Address = options.validateEIP55Address;
+    }
+
     if (typeof param === 'string') {
-      const parsedMessage = new ParsedMessage(param);
+      const parsedMessage = new ParsedMessage(param, {
+        validateEIP55Address: this.validateEIP55Address
+      });
       this.scheme = parsedMessage.scheme;
       this.domain = parsedMessage.domain;
       this.address = parsedMessage.address;
@@ -426,7 +436,7 @@ export class SiweMessage {
     }
 
     /** EIP-55 `address` check. */
-    if (!isEIP55Address(this.address)) {
+    if (this.validateEIP55Address && !isEIP55Address(this.address)) {
       throw new SiweError(
         SiweErrorType.INVALID_ADDRESS,
         getAddress(this.address),
diff --git a/packages/siwe/lib/types.ts b/packages/siwe/lib/types.ts
index df14e191..c3199cb6 100644
--- a/packages/siwe/lib/types.ts
+++ b/packages/siwe/lib/types.ts
@@ -121,3 +121,8 @@ export enum SiweErrorType {
   /** Thrown when some required field is missing. */
   UNABLE_TO_PARSE = 'Unable to parse the message.',
 }
+
+export interface SiweMessageConstructorOptions { 
+  /** If the library should validate the address against EIP-55, defaults to true */
+  validateEIP55Address?: boolean
+}