diff --git a/inst/include/dust2/continuous/system.hpp b/inst/include/dust2/continuous/system.hpp
index 9e60e3c1..d6838f57 100644
--- a/inst/include/dust2/continuous/system.hpp
+++ b/inst/include/dust2/continuous/system.hpp
@@ -15,6 +15,7 @@
 #include <dust2/packing.hpp>
 #include <dust2/properties.hpp>
 #include <dust2/tools.hpp>
+#include <dust2/trajectories.hpp>
 #include <dust2/zero.hpp>
 #include <monty/random/random.hpp>
 
diff --git a/inst/include/dust2/discrete/system.hpp b/inst/include/dust2/discrete/system.hpp
index 1bc069f3..eb5e4389 100644
--- a/inst/include/dust2/discrete/system.hpp
+++ b/inst/include/dust2/discrete/system.hpp
@@ -11,6 +11,7 @@
 #include <dust2/packing.hpp>
 #include <dust2/properties.hpp>
 #include <dust2/tools.hpp>
+#include <dust2/trajectories.hpp>
 #include <dust2/zero.hpp>
 #include <monty/random/random.hpp>