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-rw-r--r--src/ui/tool/control-point.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ui/tool/control-point.h b/src/ui/tool/control-point.h
index 0b88786e5..9f62fca42 100644
--- a/src/ui/tool/control-point.h
+++ b/src/ui/tool/control-point.h
@@ -12,6 +12,7 @@
#define SEEN_UI_TOOL_CONTROL_POINT_H
#include <boost/utility.hpp>
+#include <stddef.h>
#include <sigc++/sigc++.h>
#include <gdkmm.h>
#include <gtkmm.h>