diff --git a/src/Egulias/EmailValidator/EmailValidator.php b/src/Egulias/EmailValidator/EmailValidator.php
index e78cde0..dd69df7 100644
--- a/src/Egulias/EmailValidator/EmailValidator.php
+++ b/src/Egulias/EmailValidator/EmailValidator.php
@@ -11,8 +11,6 @@ use Egulias\EmailValidator\InvalidEmail;
  */
 class EmailValidator
 {
-    const ERR_UNCLOSEDDOMLIT     = 147;
-    const ERR_FWS_CRLF_X2        = 148;
     const ERR_FWS_CRLF_END       = 149;
     const ERR_CR_NO_LF           = 150;
     const ERR_DEPREC_REACHED     = 151;
diff --git a/src/Egulias/EmailValidator/Exception/CRLFX2.php b/src/Egulias/EmailValidator/Exception/CRLFX2.php
new file mode 100644
index 0000000..bc1f95b
--- /dev/null
+++ b/src/Egulias/EmailValidator/Exception/CRLFX2.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Egulias\EmailValidator\Exception;
+
+use Egulias\EmailValidator\InvalidEmail;
+
+class CRLFX2 extends InvalidEmail
+{
+    const CODE = 148
+    const REASON = "Folding whitespace CR LF found twice";
+}
diff --git a/src/Egulias/EmailValidator/Parser/Parser.php b/src/Egulias/EmailValidator/Parser/Parser.php
index fab18b2..08535c2 100644
--- a/src/Egulias/EmailValidator/Parser/Parser.php
+++ b/src/Egulias/EmailValidator/Parser/Parser.php
@@ -6,6 +6,7 @@ use Egulias\EmailValidator\EmailLexer;
 use Egulias\EmailValidator\EmailValidator;
 use Egulias\EmailValidator\Exception\AtextAfterCFWS;
 use Egulias\EmailValidator\Exception\ConsecutiveDot;
+use Egulias\EmailValidator\Exception\CRLFX2;
 use Egulias\EmailValidator\Exception\ExpectedQPair;
 use Egulias\EmailValidator\Exception\ExpectingATEXT;
 use Egulias\EmailValidator\Exception\ExpectingCTEXT;
@@ -188,7 +189,7 @@ abstract class Parser
             return;
         }
         if ($this->lexer->isNextToken(EmailLexer::CRLF)) {
-            throw new \InvalidArgumentException("ERR_FWS_CRLF_X2");
+            throw new CRLFX2();
         }
         if (!$this->lexer->isNextTokenAny(array(EmailLexer::S_SP, EmailLexer::S_HTAB))) {
             throw new \InvalidArgumentException("ERR_FWS_CRLF_END");