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-rw-r--r--Build/source/texk/dviljk/dvi2xx.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Build/source/texk/dviljk/dvi2xx.c b/Build/source/texk/dviljk/dvi2xx.c
index c8ce1be36df..df5dddff557 100644
--- a/Build/source/texk/dviljk/dvi2xx.c
+++ b/Build/source/texk/dviljk/dvi2xx.c
@@ -4241,7 +4241,7 @@ bool GetKeyVal(KeyWord *kw, KeyDesc tab[], int nt, int *tno)
bool IsSame(const char *a, const char *b)
{
for (; *a; a++, b++)
- if ( tolower(*a) != tolower(*b) )
+ if ( tolower((unsigned char)*a) != tolower((unsigned char)*b) )
return( _FALSE );
return( *a == *b ? _TRUE : _FALSE );