diff --git a/src/Parser/DomainPart.php b/src/Parser/DomainPart.php
index 0613e31..8dba7f1 100644
--- a/src/Parser/DomainPart.php
+++ b/src/Parser/DomainPart.php
@@ -198,6 +198,9 @@ protected function doParseDomainPart()
 
             $domain .= $this->lexer->token['value'];
             $this->lexer->moveNext();
+            if ($this->lexer->token['type'] === EmailLexer::S_SP) {
+                throw new CharNotAllowed();
+            }
         } while (null !== $this->lexer->token['type']);
 
         return $domain;
diff --git a/tests/EmailValidator/Validation/RFCValidationTest.php b/tests/EmailValidator/Validation/RFCValidationTest.php
index 4e72e9e..6a56ef3 100644
--- a/tests/EmailValidator/Validation/RFCValidationTest.php
+++ b/tests/EmailValidator/Validation/RFCValidationTest.php
@@ -167,6 +167,7 @@ public function getInvalidEmails()
             ['test@email<'],
             ['test@email{'],
             ['test@ '],
+            ['test@example.com []'],
         ];
     }