diff --git a/view.hpp b/view.hpp
index e86801fc..0a0a21f9 100644
--- a/view.hpp
+++ b/view.hpp
@@ -300,7 +300,7 @@ namespace cruft {
         [[nodiscard]] constexpr auto
         split (IndexT idx) const
         {
-            CHECK_LE (idx, size ());
+            CHECK_LE (cruft::cast::lossless<std::size_t> (idx), size ());
 
             auto last = m_begin;
             std::advance (last, idx);