diff --git a/Trigger/TrigT1/Global/GlobalSimulation/src/GlobalAlgs/Hypothesis/UCL/binStrToHexStr.h b/Trigger/TrigT1/Global/GlobalSimulation/src/GlobalAlgs/Hypothesis/UCL/binStrToHexStr.h
index 5b30ceebd7734f80898a7ab365b2edeb661be3f8..1f13064e2ea8d44472ebc4ccc9931d750d940dd1 100644
--- a/Trigger/TrigT1/Global/GlobalSimulation/src/GlobalAlgs/Hypothesis/UCL/binStrToHexStr.h
+++ b/Trigger/TrigT1/Global/GlobalSimulation/src/GlobalAlgs/Hypothesis/UCL/binStrToHexStr.h
@@ -6,6 +6,7 @@
 #ifndef GLOBALSIM_BINSTRTOHEXSTR_H
 #define GLOBALSIM_BINSTRTOHEXSTR_H
 
+#include <algorithm>
 #include <string>
 
 namespace GlobalSim {