diff --git a/sensors/manager.hpp b/sensors/manager.hpp
index 6ae39fd..f5ac50f 100644
--- a/sensors/manager.hpp
+++ b/sensors/manager.hpp
@@ -5,6 +5,7 @@
 #include <sdbusplus/bus.hpp>
 #include <sdbusplus/server.hpp>
 
+#include <functional>
 #include <map>
 #include <memory>
 #include <string>