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-rw-r--r--src/ctype/toupper.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ctype/toupper.c b/src/ctype/toupper.c
index d797e0c6..92780ed0 100644
--- a/src/ctype/toupper.c
+++ b/src/ctype/toupper.c
@@ -9,6 +9,7 @@ int toupper(int c)
{
unsigned char *map = __get_locale()->lc_ctype.ctoupper;
+ SIGNAL_SAFE(0);
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
if (c == EOF) {