diff --git a/view.hpp b/view.hpp
index 1b719778..d5eab527 100644
--- a/view.hpp
+++ b/view.hpp
@@ -275,7 +275,7 @@ namespace cruft {
 
         ///--------------------------------------------------------------------
         /// Returns true if the view is not empty; ie, there is data remaining.
-        constexpr operator bool () const noexcept
+        explicit constexpr operator bool () const noexcept
         {
             return not empty ();
         }