diff --git a/dune/common/std/constexpr.hh b/dune/common/std/constexpr.hh
index a6ae7c667b0f981f260cece50ca8124bf02f6498..3c7610f574d3676eb078ec01fa2d575aeb370ce4 100644
--- a/dune/common/std/constexpr.hh
+++ b/dune/common/std/constexpr.hh
@@ -24,4 +24,6 @@
 #define DUNE_CONSTEXPR
 #endif // #else // #if HAVE_CONSTEXPR
 
+#warning The header dune/common/std/constexpr.hh is deprecated. Just remove the include.
+
 #endif // #ifndef DUNE_COMMON_STD_CONSTEXPR_HH