diff --git a/array/darray.hpp b/array/darray.hpp
index c59de9c2..3ab374fc 100644
--- a/array/darray.hpp
+++ b/array/darray.hpp
@@ -8,6 +8,7 @@
 
 #pragma once
 
+#include "../debug/assert.hpp"
 #include "../iterator/zip.hpp"
 
 #include <iterator>
diff --git a/iterator/iota.hpp b/iterator/iota.hpp
index f0f85d9e..5674ccea 100644
--- a/iterator/iota.hpp
+++ b/iterator/iota.hpp
@@ -8,6 +8,9 @@
 
 #pragma once
 
+#include <cstddef>
+#include <iterator>
+
 namespace cruft::iterator {
     ///////////////////////////////////////////////////////////////////////////
     /// A numeric range that supplies a sequence of values.