diff --git a/CEP/DP3/AOFlagger/include/AOFlagger/msio/antennainfo.h b/CEP/DP3/AOFlagger/include/AOFlagger/msio/antennainfo.h
index fcbac538cf8009199fe59d03f67633ab243747cd..5f3b93604441994f5c6f25e973159743263cd955 100644
--- a/CEP/DP3/AOFlagger/include/AOFlagger/msio/antennainfo.h
+++ b/CEP/DP3/AOFlagger/include/AOFlagger/msio/antennainfo.h
@@ -23,6 +23,7 @@
 #include <string>
 #include <sstream>
 #include <cmath>
+#include <cstdlib>
 #include <vector>
 
 #include "types.h"