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-rw-r--r--Build/source/texk/web2c/luatexdir/pdf/pdfgen.w2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/texk/web2c/luatexdir/pdf/pdfgen.w b/Build/source/texk/web2c/luatexdir/pdf/pdfgen.w
index 0f312f2c781..78873c7b5d5 100644
--- a/Build/source/texk/web2c/luatexdir/pdf/pdfgen.w
+++ b/Build/source/texk/web2c/luatexdir/pdf/pdfgen.w
@@ -616,7 +616,7 @@ void pdf_print_str(PDF pdf, const char *s)
return;
}
s++;
- while (is_hex_char(*s))
+ while (is_hex_char((unsigned char)*s))
s++;
if (s != orig + l) {
pdf_out(pdf, '(');