--- a/source/ps/Util.cpp
+++ b/source/ps/Util.cpp
@@ -24,6 +24,7 @@
 #include "ps/CLogger.h"
 #include "ps/Filesystem.h"
 #include "ps/Pyrogenesis.h"
+#include <iomanip>
 
 // not thread-safe!
 static const wchar_t* HardcodedErrorString(int err)