diff --git a/include/os/freebsd/spl/sys/list_impl.h b/include/os/freebsd/spl/sys/list_impl.h
index 09b70232e8..06a5c6d1db 100644
--- a/include/os/freebsd/spl/sys/list_impl.h
+++ b/include/os/freebsd/spl/sys/list_impl.h
@@ -39,7 +39,6 @@ struct list_node {
 };
 
 struct list {
-	size_t	list_size;
 	size_t	list_offset;
 	struct list_node list_head;
 };
diff --git a/include/os/linux/spl/sys/list.h b/include/os/linux/spl/sys/list.h
index 80300df15a..046a75e193 100644
--- a/include/os/linux/spl/sys/list.h
+++ b/include/os/linux/spl/sys/list.h
@@ -48,7 +48,6 @@
 typedef struct list_head list_node_t;
 
 typedef struct list {
-	size_t list_size;
 	size_t list_offset;
 	list_node_t list_head;
 } list_t;
@@ -72,7 +71,8 @@ list_link_init(list_node_t *node)
 static inline void
 list_create(list_t *list, size_t size, size_t offset)
 {
-	list->list_size = size;
+	(void) size;
+
 	list->list_offset = offset;
 	INIT_LIST_HEAD(&list->list_head);
 }
diff --git a/lib/libspl/include/sys/list_impl.h b/lib/libspl/include/sys/list_impl.h
index 24c1ceb2a9..629db34da0 100644
--- a/lib/libspl/include/sys/list_impl.h
+++ b/lib/libspl/include/sys/list_impl.h
@@ -39,7 +39,6 @@ struct list_node {
 };
 
 struct list {
-	size_t	list_size;
 	size_t	list_offset;
 	struct list_node list_head;
 };
diff --git a/lib/libspl/list.c b/lib/libspl/list.c
index 2440369862..aaa71dc73c 100644
--- a/lib/libspl/list.c
+++ b/lib/libspl/list.c
@@ -65,7 +65,8 @@ list_create(list_t *list, size_t size, size_t offset)
 	ASSERT(size > 0);
 	ASSERT(size >= offset + sizeof (list_node_t));
 
-	list->list_size = size;
+	(void) size;
+
 	list->list_offset = offset;
 	list->list_head.next = list->list_head.prev = &list->list_head;
 }
@@ -194,7 +195,6 @@ list_move_tail(list_t *dst, list_t *src)
 	list_node_t *dstnode = &dst->list_head;
 	list_node_t *srcnode = &src->list_head;
 
-	ASSERT(dst->list_size == src->list_size);
 	ASSERT(dst->list_offset == src->list_offset);
 
 	if (list_empty(src))
diff --git a/module/os/freebsd/spl/list.c b/module/os/freebsd/spl/list.c
index ab6049cfbd..56432050fd 100644
--- a/module/os/freebsd/spl/list.c
+++ b/module/os/freebsd/spl/list.c
@@ -64,7 +64,8 @@ list_create(list_t *list, size_t size, size_t offset)
 	ASSERT3P(list, !=, NULL);
 	ASSERT3U(size, >=, offset + sizeof (list_node_t));
 
-	list->list_size = size;
+	(void) size;
+
 	list->list_offset = offset;
 	list->list_head.list_next = list->list_head.list_prev =
 	    &list->list_head;
@@ -194,7 +195,6 @@ list_move_tail(list_t *dst, list_t *src)
 	list_node_t *dstnode = &dst->list_head;
 	list_node_t *srcnode = &src->list_head;
 
-	ASSERT3U(dst->list_size, ==, src->list_size);
 	ASSERT3U(dst->list_offset, ==, src->list_offset);
 
 	if (list_empty(src))