diff --git a/src/rpp/rpp/observables.hpp b/src/rpp/rpp/observables.hpp index d67892f8c..059916ca1 100644 --- a/src/rpp/rpp/observables.hpp +++ b/src/rpp/rpp/observables.hpp @@ -76,6 +76,7 @@ #include #include +#include #include #include #include