diff --git a/build/service/CalendarExtractor.php b/build/service/CalendarExtractor.php
index 81e7b0d..6d411da 100644
--- a/build/service/CalendarExtractor.php
+++ b/build/service/CalendarExtractor.php
@@ -273,7 +273,7 @@
 			$type_name = [];
 
 			foreach($this->event_t as $color=>$uid)
-				$type_name[$uid] = $color;
+				$type_name[$uid] = dechex($color); // hexa representation
 
 
 			/* [2] For each event