diff --git a/cfg/zephyr.cfg b/cfg/zephyr.cfg
index 552335f2c43..999de4ea1b5 100644
--- a/cfg/zephyr.cfg
+++ b/cfg/zephyr.cfg
@@ -108,6 +108,6 @@
   <define name="KERN_CONT" value="&quot;c&quot;"/>
 
   <define name="ARRAY_SIZE(array)" value="(sizeof(array) / sizeof((array)[0]))"/>
-  <define name="BIT(x)" value="(1UL<<x)"/>
+  <define name="BIT(x)" value="(1UL&lt;&lt;x)"/>
   <define name="IS_ENABLED(flag)" value="flag"/>
 </def>