diff --git a/ubi/activation_ubi.hpp b/ubi/activation_ubi.hpp
index a6ef436..957ee06 100644
--- a/ubi/activation_ubi.hpp
+++ b/ubi/activation_ubi.hpp
@@ -2,6 +2,8 @@
 
 #include "activation.hpp"
 
+#include <string>
+
 namespace openpower
 {
 namespace software