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-rw-r--r--common/parse.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/parse.c b/common/parse.c
index 3e1b3bb7..f459d239 100644
--- a/common/parse.c
+++ b/common/parse.c
@@ -4971,7 +4971,7 @@ struct option *option;
fmt = option->format;
/* 'a' means always uniform */
- if ((fmt[0] != 'Z') && (tolower((int)fmt[1]) == 'a'))
+ if ((fmt[0] != 'Z') && (tolower((unsigned char)fmt[1]) == 'a'))
uniform = 1;
do {