diff --git a/demos/STM32/NASA-OSAL-STM32F407-DISCOVERY/cfg/chconf.h b/demos/STM32/NASA-OSAL-STM32F407-DISCOVERY/cfg/chconf.h
index f3fe923d4..c8197f52f 100644
--- a/demos/STM32/NASA-OSAL-STM32F407-DISCOVERY/cfg/chconf.h
+++ b/demos/STM32/NASA-OSAL-STM32F407-DISCOVERY/cfg/chconf.h
@@ -704,7 +704,8 @@
  * @details User fields added to the end of the @p thread_t structure.
  */
 #define CH_CFG_THREAD_EXTRA_FIELDS                                          \
-  /* Add threads custom fields here.*/
+  /* Add threads custom fields here.*/                                      \
+  void *osal_delete_handler;
 
 /**
  * @brief   Threads initialization hook.
diff --git a/demos/STM32/NASA-OSAL-STM32F746G-DISCOVERY/cfg/chconf.h b/demos/STM32/NASA-OSAL-STM32F746G-DISCOVERY/cfg/chconf.h
index 5279db677..ca40a3fcf 100644
--- a/demos/STM32/NASA-OSAL-STM32F746G-DISCOVERY/cfg/chconf.h
+++ b/demos/STM32/NASA-OSAL-STM32F746G-DISCOVERY/cfg/chconf.h
@@ -704,7 +704,8 @@
  * @details User fields added to the end of the @p thread_t structure.
  */
 #define CH_CFG_THREAD_EXTRA_FIELDS                                          \
-  /* Add threads custom fields here.*/
+  /* Add threads custom fields here.*/                                      \
+  void *osal_delete_handler;
 
 /**
  * @brief   Threads initialization hook.