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-rw-r--r--src/utilities/util_misc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/utilities/util_misc.c b/src/utilities/util_misc.c
index f45f6b339f2..3c4e8d2dfa1 100644
--- a/src/utilities/util_misc.c
+++ b/src/utilities/util_misc.c
@@ -108,7 +108,7 @@ util_str2recno(WT_SESSION *session, const char *p, uint64_t *recnop)
* forth -- none of them are OK with us. Check the string starts with
* digit, that turns off the special processing.
*/
- if (!isdigit(p[0]))
+ if (!__wt_isdigit((u_char)p[0]))
goto format;
errno = 0;