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Diffstat (limited to 'Build/source/texk/xdvik/hypertex.c')
-rw-r--r--Build/source/texk/xdvik/hypertex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/texk/xdvik/hypertex.c b/Build/source/texk/xdvik/hypertex.c
index de4de61cf56..ac9d35934c1 100644
--- a/Build/source/texk/xdvik/hypertex.c
+++ b/Build/source/texk/xdvik/hypertex.c
@@ -1141,7 +1141,7 @@ scan_ps_literal_text_string(const char *str)
case '\n': break;
case '\r': if (*(str + 1) == '\n') str++; break;
default:
- if (isdigit(*str)) {
+ if (isdigit((unsigned char)*str)) {
char number[] = "xxx";
char *end;
strncpy(number, str, 3);