diff --git a/src/PawelDziok/GraphqlParser/Parser.php b/src/PawelDziok/GraphqlParser/Parser.php
index e8df713..5fa2ad7 100644
--- a/src/PawelDziok/GraphqlParser/Parser.php
+++ b/src/PawelDziok/GraphqlParser/Parser.php
@@ -75,12 +75,12 @@ public function parseFieldList()
     public function parseField()
     {
         $name = $this->parseIdentifier();
-        $params = $this->match(Token::TYPE_LPAREN) ? $this->parseArgumentList() : [];
         $alias = null;
         if ($this->eat(Token::TYPE_COLON)) {
             $alias = $name;
             $name = $this->parseIdentifier();
         }
+        $params = $this->match(Token::TYPE_LPAREN) ? $this->parseArgumentList() : [];
         $fields = $this->match(Token::TYPE_LBRACE) ? $this->parseFieldList() : [];
 
         return new Field($name, $alias, $params, $fields);
diff --git a/src/PawelDziok/GraphqlParser/Token.php b/src/PawelDziok/GraphqlParser/Token.php
index dcbe679..abaf8ba 100644
--- a/src/PawelDziok/GraphqlParser/Token.php
+++ b/src/PawelDziok/GraphqlParser/Token.php
@@ -20,7 +20,7 @@ class Token
     const TYPE_RBRACE = '}';
     const TYPE_LPAREN = '(';
     const TYPE_RPAREN = ')';
-    const TYPE_COLON = ' = ';
+    const TYPE_COLON = ':';
     const TYPE_COMMA = ',';
     const TYPE_AMP = '&';