diff --git a/core/mem/allocators.odin b/core/mem/allocators.odin
index cb9301f60..2d7e7b3ea 100644
--- a/core/mem/allocators.odin
+++ b/core/mem/allocators.odin
@@ -2331,7 +2331,7 @@ buddy_allocator_alloc_bytes_non_zeroed :: proc(b: ^Buddy_Allocator, size: uint)
 		}
 		found.is_free = false
 		data := ([^]byte)(found)[b.alignment:][:size]
-		assert(cast(uintptr)raw_data(data)+cast(uintptr)size < cast(uintptr)buddy_block_next(found), "Buddy_Allocator has made an allocation which overlaps a block header.")
+		assert(cast(uintptr)raw_data(data)+cast(uintptr)(size-1) < cast(uintptr)buddy_block_next(found), "Buddy_Allocator has made an allocation which overlaps a block header.")
 		// ensure_poisoned(data)
 		// sanitizer.address_unpoison(data)
 		return data, nil