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diff --git a/source/spyview/Gnuplot_Interface.H b/source/spyview/Gnuplot_Interface.H
index f15cb08..ef6fb2d 100644
--- a/spyview/Gnuplot_Interface.H
+++ b/spyview/Gnuplot_Interface.H
@@ -5,6 +5,7 @@
#include <assert.h>
#include <errno.h>
#include <vector>
+#include <sys/types.h>
#include "message.h"
/* With the need for bi-directional communications with gnuplot,
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