diff --git a/libmango/include/mango/types.h b/libmango/include/mango/types.h
index 701212e..80644bc 100644
--- a/libmango/include/mango/types.h
+++ b/libmango/include/mango/types.h
@@ -26,6 +26,7 @@
 
 /* config keys for use with task_config_get/task_config_set */
 #define TASK_CFG_INVALID             0x00000u
+#define TASK_CFG_ID                  0x10001u
 
 /* config keys for use with thread_config_get/thread_config_set */
 #define THREAD_CFG_INVALID           0x00000u