diff --git a/view.hpp b/view.hpp
index 3ba73bd9..cfe5f081 100644
--- a/view.hpp
+++ b/view.hpp
@@ -339,9 +339,11 @@ namespace util {
 
         //---------------------------------------------------------------------
         [[nodiscard]] constexpr util::view<BeginT,EndT>
-        consume (util::view<BeginT,BeginT> prefix) const
+        consume (util::view<BeginT,EndT> prefix) const
         {
             assert (prefix.begin () == begin ());
+            assert (prefix.end () < end ());
+
             return { prefix.end (), end () };
         }