diff --git a/boards/default_src/micropython/blocks/system.js b/boards/default_src/micropython/blocks/system.js
index 94f9de74..5dc6b62f 100644
--- a/boards/default_src/micropython/blocks/system.js
+++ b/boards/default_src/micropython/blocks/system.js
@@ -159,6 +159,7 @@ export const system_timer = {
         this.setPreviousStatement(true);
         this.setNextStatement(true);
         this.setTooltip(Blockly.Msg.MIXLY_ESP32_SYSTEM_TIMER_TOOLTIP);
+        this.setWarningText(Blockly.Msg.MIXLY_DEPRECATED_WARNING_TEXT);
     }
 };
 
@@ -193,6 +194,7 @@ export const system_timer_init = {
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
         this.setTooltip(Blockly.Msg.MIXLY_ESP32_SYSTEM_TIMER_INIT_TOOLTIP);
+        this.setWarningText(Blockly.Msg.MIXLY_DEPRECATED_WARNING_TEXT);
     }
 };