diff --git a/version.hpp b/version.hpp
index f04cce2..e26e4eb 100644
--- a/version.hpp
+++ b/version.hpp
@@ -6,6 +6,7 @@
 
 #include <functional>
 #include <sdbusplus/bus.hpp>
+#include <string>
 
 namespace phosphor
 {