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-rw-r--r--Src/options.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/Src/options.c b/Src/options.c
index b46986495..14b730ea5 100644
--- a/Src/options.c
+++ b/Src/options.c
@@ -571,7 +571,9 @@ bin_setopt(char *nam, char **args, UNUSED(Options ops), int isun)
if (*t == '_')
chuck(t);
else {
- *t = tulower(*t);
+ /* See comment in optlookup() */
+ if (*t >= 'A' && *t <= 'Z')
+ *t = (*t - 'A') + 'a';
t++;
}