X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/321fe707f48f675a6b9f08f82c1f2bfdda808811..43dc3c8bc49885693e3e06c560c8d2ee71a984b9:/src/scan-gram.l

diff --git a/src/scan-gram.l b/src/scan-gram.l
index 7cb99f89..ee9f1174 100644
--- a/src/scan-gram.l
+++ b/src/scan-gram.l
@@ -439,7 +439,7 @@ splice	 (\\[ \f\t\v]*\n)*
   \\(.|\n)	{
     char const *p = yytext + 1;
     /* Quote only if escaping won't make the character visible.  */
-    if (isspace (*p) && isprint (*p))
+    if (isspace ((unsigned char) *p) && isprint ((unsigned char) *p))
       p = quote (p);
     else
       p = quotearg_style_mem (escape_quoting_style, p, 1);