diff --git a/src/list.c b/src/list.c
index acba56a..cca816e 100644
--- a/src/list.c
+++ b/src/list.c
@@ -93,8 +93,6 @@ size_t list_add(List* self, void* item) {
 }
 
 void list_insert(List* self, void* item, size_t at) {
-    ASSERT_RETURN(at < self->len,, "Index %zu out of bounds", at);
-
     list_reserve(self, self->len + 1);
 
     if(at == self->len - 1) {
@@ -113,6 +111,7 @@ void list_insert(List* self, void* item, size_t at) {
     uint8_t* end = data.as_byte + self->element_size * self->len;
     memmove(into, from, end - from);
     memcpy(from, item, self->element_size);
+    ++self->len;
 }
 
 void list_erase(List* self, size_t at) {