diff --git a/application/config/constants.php b/application/config/constants.php
index 4815db1b4..9136d470b 100644
--- a/application/config/constants.php
+++ b/application/config/constants.php
@@ -93,8 +93,8 @@ define('DECIMAL', 'DECIMAL');
 define('DATE', 'DATE');
 define('TEXT', 'TEXT');
 define('CHECKBOX', 'CHECKBOX');
-define(NO_DEFINITION_ID, 0);
-define(CATEGORY_DEFINITION_ID, -1);
+define('NO_DEFINITION_ID', 0);
+define('CATEGORY_DEFINITION_ID', -1);
 
 
 const DEFINITION_TYPES = [GROUP, DROPDOWN, DECIMAL, TEXT, DATE, CHECKBOX];
@@ -143,4 +143,4 @@ define('SALE_TYPE_QUOTE', 3);
 define('SALE_TYPE_RETURN', 4);
 
 define('PERCENT', 0);
-define('FIXED', 1);
\ No newline at end of file
+define('FIXED', 1);