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-rw-r--r--lib/frrstr.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/frrstr.c b/lib/frrstr.c
index c575c0b56..8a72a35af 100644
--- a/lib/frrstr.c
+++ b/lib/frrstr.c
@@ -209,7 +209,7 @@ bool frrstr_endswith(const char *str, const char *suffix)
int all_digit(const char *str)
{
for (; *str != '\0'; str++)
- if (!isdigit((int)*str))
+ if (!isdigit((unsigned char)*str))
return 0;
return 1;
}