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-rw-r--r--libguile/numbers.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libguile/numbers.c b/libguile/numbers.c
index ff963dbfa..58125763f 100644
--- a/libguile/numbers.c
+++ b/libguile/numbers.c
@@ -2488,7 +2488,7 @@ enum t_exactness {NO_EXACTNESS, INEXACT, EXACT};
#define XDIGIT2UINT(d) \
(uc_is_property_decimal_digit ((int) (unsigned char) d) \
? (d) - '0' \
- : tolower ((int) (unsigned char) d) - 'a' + 10)
+ : uc_tolower ((int) (unsigned char) d) - 'a' + 10)
static SCM
mem2uinteger (SCM mem, unsigned int *p_idx,