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-rw-r--r--py/mpconfig.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 5601cc2f7..8e06153a8 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -1468,7 +1468,9 @@ typedef double mp_float_t;
#define BYTES_PER_WORD (sizeof(mp_uint_t))
#endif
+#ifndef BITS_PER_BYTE
#define BITS_PER_BYTE (8)
+#endif
#define BITS_PER_WORD (BITS_PER_BYTE * BYTES_PER_WORD)
// mp_int_t value with most significant bit set
#define WORD_MSBIT_HIGH (((mp_uint_t)1) << (BYTES_PER_WORD * 8 - 1))