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-rw-r--r--src/ui/tool/node-tool.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ui/tool/node-tool.h b/src/ui/tool/node-tool.h
index bcf6a8d5e..d005a0bdf 100644
--- a/src/ui/tool/node-tool.h
+++ b/src/ui/tool/node-tool.h
@@ -14,6 +14,7 @@
#include <memory>
#include <boost/ptr_container/ptr_map.hpp>
#include <glib.h>
+#include <stddef.h>
#include <sigc++/sigc++.h>
#include "event-context.h"
#include "forward.h"