diff --git a/lib/libspl/include/umem.h b/lib/libspl/include/umem.h
index 68ff9a576..0d0778cfb 100644
--- a/lib/libspl/include/umem.h
+++ b/lib/libspl/include/umem.h
@@ -109,6 +109,8 @@ umem_alloc_aligned(size_t size, size_t align, int flags)
 		return (NULL);
 	}
 
+	ASSERT0(P2PHASE_TYPED(ptr, align, uint64_t));
+
 	return (ptr);
 }