diff --git a/include/larena.h b/include/larena.h
index 5ebd907..d3afbc7 100644
--- a/include/larena.h
+++ b/include/larena.h
@@ -163,11 +163,11 @@ static inline void *larena_alloc_aligned(LArena *arena, size_t sz, unsigned int
     assert(align != 0);
     assert((align & (align - 1)) == 0);  // power of 2
 
-    uintptr_t curr = (uintptr_t)arena->curr;
+    uintptr_t curr = (uintptr_t)arena->;
     uintptr_t aligned = (curr + (align - (uintptr_t)1)) & ~(align - (uintptr_t)1);
     uint8_t *start = (uint8_t *)aligned;
 
-    if (sz > (larena_available(arena))) {
+    if (sz > (size_t)(arena->end - start)) {
         return NULL;
     }