diff --git a/plugins/actuation_delay/ActuationDelay.h b/plugins/actuation_delay/ActuationDelay.h
index 9d4a5ba..35d937d 100644
--- a/plugins/actuation_delay/ActuationDelay.h
+++ b/plugins/actuation_delay/ActuationDelay.h
@@ -1,6 +1,8 @@
 #ifndef GAZEBO_SCENARIO_PLUGINS_ACTUATIONDELAY_H
 #define GAZEBO_SCENARIO_PLUGINS_ACTUATIONDELAY_H
 
+#include <cstdint>
+
 #include <ignition/gazebo/Entity.hh>
 #include <ignition/gazebo/EntityComponentManager.hh>
 #include <ignition/gazebo/EventManager.hh>
diff --git a/plugins/low_pass_target/LowPassTarget.h b/plugins/low_pass_target/LowPassTarget.h
index c90c27e..25ecf17 100644
--- a/plugins/low_pass_target/LowPassTarget.h
+++ b/plugins/low_pass_target/LowPassTarget.h
@@ -1,6 +1,8 @@
 #ifndef GAZEBO_SCENARIO_PLUGINS_LOW_PASS_TARGET_H
 #define GAZEBO_SCENARIO_PLUGINS_LOW_PASS_TARGET_H
 
+#include <cstdint>
+
 #include <ignition/gazebo/Entity.hh>
 #include <ignition/gazebo/EntityComponentManager.hh>
 #include <ignition/gazebo/EventManager.hh>