diff --git a/src/pathwatch.hpp b/src/pathwatch.hpp
index b0b8b42..25fd6de 100644
--- a/src/pathwatch.hpp
+++ b/src/pathwatch.hpp
@@ -10,6 +10,8 @@
 #include "data_types.hpp"
 #include "watch.hpp"
 
+#include <string>
+
 namespace phosphor
 {
 namespace dbus