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-rw-r--r--src/backend/commands/proclang.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/commands/proclang.c b/src/backend/commands/proclang.c
index 5d4d3f09bf7..aead01b9736 100644
--- a/src/backend/commands/proclang.c
+++ b/src/backend/commands/proclang.c
@@ -31,7 +31,7 @@ case_translate_language_name(const char *input, char *output)
int i;
for (i = 0; i < NAMEDATALEN && input[i]; ++i)
- output[i] = tolower(input[i]);
+ output[i] = tolower((unsigned char) input[i]);
output[i] = '\0';