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-rw-r--r--Modules/_io/bytesio.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index 3ab503c..f307420 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -1,5 +1,7 @@
#include "Python.h"
#include "pycore_object.h"
+#include "pycore_sysmodule.h" // _PySys_GetSizeOf()
+
#include <stddef.h> // offsetof()
#include "_iomodule.h"