diff --git a/rosbag2_cpp/include/rosbag2_cpp/clocks/player_clock.hpp b/rosbag2_cpp/include/rosbag2_cpp/clocks/player_clock.hpp
index b7554f061..77f236ed1 100644
--- a/rosbag2_cpp/include/rosbag2_cpp/clocks/player_clock.hpp
+++ b/rosbag2_cpp/include/rosbag2_cpp/clocks/player_clock.hpp
@@ -80,6 +80,7 @@ class PlayerClock
   /**
    * \return whether the clock is currently sleeping.
    */
+  ROSBAG2_CPP_PUBLIC
   virtual bool is_sleeping() = 0;
 
   /**