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-rw-r--r--py/mphal.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/mphal.h b/py/mphal.h
index 81cf50918..a4f222d0b 100644
--- a/py/mphal.h
+++ b/py/mphal.h
@@ -56,7 +56,7 @@ void mp_hal_stdout_tx_str(const char *str);
#endif
#ifndef mp_hal_stdout_tx_strn
-void mp_hal_stdout_tx_strn(const char *str, size_t len);
+mp_uint_t mp_hal_stdout_tx_strn(const char *str, size_t len);
#endif
#ifndef mp_hal_stdout_tx_strn_cooked