diff --git a/CheckClass.cpp b/CheckClass.cpp
index f8cd8a92e..97e98a205 100644
--- a/CheckClass.cpp
+++ b/CheckClass.cpp
@@ -7,6 +7,7 @@
 #include <string>
 #include <sstream>
 #include <cstring>
+#include <algorithm>
 
 
 #ifdef __BORLANDC__