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-rw-r--r--st.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/st.c b/st.c
index 29b7462..7b755eb 100644
--- a/st.c
+++ b/st.c
@@ -377,7 +377,7 @@ static const char base64_digits[] = {
char
base64dec_getc(const char **src)
{
- while (**src && !isprint(**src))
+ while (**src && !isprint((unsigned char)**src))
(*src)++;
return **src ? *((*src)++) : '='; /* emulate padding if string ends */
}