diff --git a/kvoctrain/kvoctrain/kvt-core/kvd_csv.cpp b/kvoctrain/kvoctrain/kvt-core/kvd_csv.cpp
index d1d22127..3d3ed9bd 100644
--- a/kvoctrain/kvoctrain/kvt-core/kvd_csv.cpp
+++ b/kvoctrain/kvoctrain/kvt-core/kvd_csv.cpp
@@ -30,6 +30,7 @@
 #include <tqtextcodec.h>
 
 #include <vector>
+#include <algorithm>
 using namespace std;
 
 vector<int> getCsvOrderStatic(kvoctrainDoc *doc)