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-rw-r--r--src/cursor/cur_dump.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cursor/cur_dump.c b/src/cursor/cur_dump.c
index 32353e0a28d..595915df7b7 100644
--- a/src/cursor/cur_dump.c
+++ b/src/cursor/cur_dump.c
@@ -128,7 +128,7 @@ str2recno(WT_SESSION_IMPL *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;