diff --git a/src/libCom/osi/epicsThread.cpp b/src/libCom/osi/epicsThread.cpp
index 05e1f8068..149e26cb7 100644
--- a/src/libCom/osi/epicsThread.cpp
+++ b/src/libCom/osi/epicsThread.cpp
@@ -14,6 +14,7 @@
 
 #include <exception>
 #include <typeinfo>
+#include <algorithm>
 
 #include <stdio.h>
 #include <stddef.h>