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-rw-r--r--src/message-stack.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/message-stack.h b/src/message-stack.h
index b5f1dd345..ae8860965 100644
--- a/src/message-stack.h
+++ b/src/message-stack.h
@@ -14,6 +14,7 @@
#ifndef SEEN_INKSCAPE_MESSAGE_STACK_H
#define SEEN_INKSCAPE_MESSAGE_STACK_H
+#include <stddef.h>
#include <sigc++/sigc++.h>
#include <glib.h>
#include <stdarg.h>