diff --git a/src/misc/bitSet.cpp b/src/misc/bitSet.cpp
index f9b6798..596ad11 100644
--- a/src/misc/bitSet.cpp
+++ b/src/misc/bitSet.cpp
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <iostream>
 #include <stdexcept>
+#include <algorithm>
 
 #include <epicsMutex.h>