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-rw-r--r--Build/source/texk/web2c/luatexdir/font/writettf.w2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/texk/web2c/luatexdir/font/writettf.w b/Build/source/texk/web2c/luatexdir/font/writettf.w
index 2cab4b2371c..169e1c20d81 100644
--- a/Build/source/texk/web2c/luatexdir/font/writettf.w
+++ b/Build/source/texk/web2c/luatexdir/font/writettf.w
@@ -622,7 +622,7 @@ static char *strip_spaces_and_delims(char *s, int l)
for (i = 0; i < l; s++, i++) {
if (*s == '(' || *s == ')' || *s == '<' || *s == '>' ||
*s == '[' || *s == ']' || *s == '{' || *s == '}' ||
- *s == '/' || *s == '%' || isspace(*s))
+ *s == '/' || *s == '%' || isspace((unsigned char)*s))
continue;
*p++ = *s;
}