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-rw-r--r--string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index adc1c8d..b637fd2 100644
--- a/string.c
+++ b/string.c
@@ -1662,7 +1662,7 @@ rb_str_upcase_bang(str)
if (ismbchar(*s)) {
s+=mbclen(*s) - 1;
}
- else if (islower(*s)) {
+ else if (ISLOWER(*s)) {
*s = toupper(*s);
modify = 1;
}