diff --git a/ApplicationLibCode/UnitTests/RiuSummaryVectorDescriptionMap-Test.cpp b/ApplicationLibCode/UnitTests/RiuSummaryVectorDescriptionMap-Test.cpp
index f19bbb7e7e..04e54d8f92 100644
--- a/ApplicationLibCode/UnitTests/RiuSummaryVectorDescriptionMap-Test.cpp
+++ b/ApplicationLibCode/UnitTests/RiuSummaryVectorDescriptionMap-Test.cpp
@@ -2,6 +2,7 @@
 
 #include "RiuSummaryQuantityNameInfoProvider.h"
 #include <chrono>
+#include <iomanip>
 
 //--------------------------------------------------------------------------------------------------
 ///