diff --git a/Sources/Plasma/PubUtilLib/plContainer/plConfigInfo.h b/Sources/Plasma/PubUtilLib/plContainer/plConfigInfo.h
index 6688a5f5e9..7f289dee07 100644
--- a/Sources/Plasma/PubUtilLib/plContainer/plConfigInfo.h
+++ b/Sources/Plasma/PubUtilLib/plContainer/plConfigInfo.h
@@ -43,11 +43,9 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #define plConfigInfo_h_inc
 
 #include "plKeysAndValues.h"
-#include <vector>
-
-/////////////////////////////////////////////////
 
-namespace ST { class string; }
+#include <string_theory/format>
+#include <vector>
 
 typedef std::vector<ST::string>     plStringList;