diff --git a/manager.hpp b/manager.hpp
index b0446b6..eff9e10 100644
--- a/manager.hpp
+++ b/manager.hpp
@@ -9,6 +9,7 @@
 #include <experimental/filesystem>
 #include <map>
 #include <sdbusplus/bus.hpp>
+#include <string>
 #ifdef USE_POLICY_INTERFACE
 #include "policy_table.hpp"
 #endif