diff --git a/dune/xt/functions/interfaces/function.hh b/dune/xt/functions/interfaces/function.hh
index b7a93015dda02092ba658bc9d1dca5e1ab41732f..1c25e07336856aaf3572cc3225a277d7078dc80c 100644
--- a/dune/xt/functions/interfaces/function.hh
+++ b/dune/xt/functions/interfaces/function.hh
@@ -183,7 +183,7 @@ public:
   }
 
   template <class OtherType>
-  typename std::enable_if<is_grid_function<OtherType>::value, Functions::ProductFunction<ThisType, OtherType>>::type
+  typename std::enable_if<true, Functions::ProductFunction<ThisType, OtherType>>::type
   operator*(const OtherType& other) const
   {
     return Functions::ProductFunction<ThisType, OtherType>(*this, other);