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-rw-r--r--certs/blacklist.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/certs/blacklist.c b/certs/blacklist.c
index 2719fb2fbc1c..a888b934a1cd 100644
--- a/certs/blacklist.c
+++ b/certs/blacklist.c
@@ -37,7 +37,7 @@ static int blacklist_vet_description(const char *desc)
found_colon:
desc++;
for (; *desc; desc++) {
- if (!isxdigit(*desc))
+ if (!isxdigit(*desc) || isupper(*desc))
return -EINVAL;
n++;
}