diff --git a/src/propertywatchimpl.hpp b/src/propertywatchimpl.hpp
index 048050e..60aff5c 100644
--- a/src/propertywatchimpl.hpp
+++ b/src/propertywatchimpl.hpp
@@ -6,6 +6,7 @@
 
 #include <sdbusplus/bus/match.hpp>
 #include <sdbusplus/message.hpp>
+#include <string>
 #include <vector>
 
 namespace phosphor