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-rw-r--r--crypto/pem/pem_lib.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/pem/pem_lib.c b/crypto/pem/pem_lib.c
index c82b3c0ae263..865976bf8cce 100644
--- a/crypto/pem/pem_lib.c
+++ b/crypto/pem/pem_lib.c
@@ -536,7 +536,8 @@ int PEM_get_EVP_CIPHER_INFO(char *header, EVP_CIPHER_INFO *cipher)
((c >= '0') && (c <= '9'))))
break;
#else
- if (!(isupper(c) || (c == '-') || isdigit(c)))
+ if (!(isupper((unsigned char)c) || (c == '-')
+ || isdigit((unsigned char)c)))
break;
#endif
header++;