diff --git a/src/journal.hpp b/src/journal.hpp
index e69a709..29d01d1 100644
--- a/src/journal.hpp
+++ b/src/journal.hpp
@@ -4,6 +4,7 @@
 #include "format.hpp"
 
 #include <phosphor-logging/log.hpp>
+#include <string>
 
 namespace phosphor
 {