diff --git a/src/kernel/memory/pmm.tt b/src/kernel/memory/pmm.tt
index eff76e4..59ca725 100644
--- a/src/kernel/memory/pmm.tt
+++ b/src/kernel/memory/pmm.tt
@@ -13,3 +13,8 @@ TEST(alloc_returns_freed_page)
   void *a = pmm_alloc();
   ASSERT_EQ_PTR(a, &mem[0]);
 }
+TEST(alloc_returns_0_if_no_free_pages)
+{
+  void *a = pmm_alloc();
+  ASSERT_EQ_PTR(a, 0);
+}