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-rw-r--r--src/PortID.hpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/PortID.hpp b/src/PortID.hpp
index 03d655f..2ef7a0c 100644
--- a/src/PortID.hpp
+++ b/src/PortID.hpp
@@ -22,6 +22,7 @@
#include "warnings.hpp"
#include <cassert>
+#include <cstddef>
#include <cstdint>
#include <functional>
#include <iostream>