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-rw-r--r--lib/curl_ntlm_core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/curl_ntlm_core.c b/lib/curl_ntlm_core.c
index b15215b2f..25f2a3ad4 100644
--- a/lib/curl_ntlm_core.c
+++ b/lib/curl_ntlm_core.c
@@ -522,7 +522,7 @@ static void ascii_uppercase_to_unicode_le(unsigned char *dest,
{
size_t i;
for(i = 0; i < srclen; i++) {
- dest[2 * i] = (unsigned char)(toupper(src[i]));
+ dest[2 * i] = (unsigned char)(toupper((unsigned char)src[i]));
dest[2 * i + 1] = '\0';
}
}