diff --git a/include/sys/spa.h b/include/sys/spa.h
index ac0847793..1fa204400 100644
--- a/include/sys/spa.h
+++ b/include/sys/spa.h
@@ -723,12 +723,12 @@ typedef enum spa_mode {
  * Send TRIM commands in-line during normal pool operation while deleting.
  *	OFF: no
  *	ON: yes
- * NB: IN_BASE is defined within the FreeBSD sources.
+ * NB: IN_FREEBSD_BASE is defined within the FreeBSD sources.
  */
 typedef enum {
 	SPA_AUTOTRIM_OFF = 0,	/* default */
 	SPA_AUTOTRIM_ON,
-#ifdef IN_BASE
+#ifdef IN_FREEBSD_BASE
 	SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_ON,
 #else
 	SPA_AUTOTRIM_DEFAULT = SPA_AUTOTRIM_OFF,