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-rw-r--r--py/mphal.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/py/mphal.h b/py/mphal.h
index a4f222d0b..d52e10be4 100644
--- a/py/mphal.h
+++ b/py/mphal.h
@@ -27,6 +27,7 @@
#define MICROPY_INCLUDED_PY_MPHAL_H
#include <stdint.h>
+#include <stddef.h>
#include "py/mpconfig.h"
#ifdef MICROPY_MPHALPORT_H