13 lines
318 B
Diff
13 lines
318 B
Diff
diff --git a/sigc++/signal_base.h b/sigc++/signal_base.h
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index 1638642..e43bd5e 100644
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--- a/sigc++/signal_base.h
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+++ b/sigc++/signal_base.h
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@@ -21,6 +21,7 @@
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#ifndef _SIGC_SIGNAL_BASE_H_
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#define _SIGC_SIGNAL_BASE_H_
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+#include <cstddef>
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#include <list>
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#include <sigc++config.h>
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#include <sigc++/type_traits.h>
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