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-rw-r--r--lib/getdate.y2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/getdate.y b/lib/getdate.y
index 4362443e5..0e508e4a4 100644
--- a/lib/getdate.y
+++ b/lib/getdate.y
@@ -751,7 +751,7 @@ LookupWord (YYSTYPE *yylval, char *buff)
/* Make it lowercase. */
for (p = buff; *p; p++)
if (ISUPPER ((unsigned char) *p))
- *p = tolower (*p);
+ *p = tolower ((int)*p);
if (strcmp (buff, "am") == 0 || strcmp (buff, "a.m.") == 0)
{