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-rw-r--r--src/join.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/join.c b/src/join.c
index 4aeffb6d3..57f4665bc 100644
--- a/src/join.c
+++ b/src/join.c
@@ -857,7 +857,7 @@ string_to_join_field (char const *str)
If S is valid, return true. Otherwise, give a diagnostic and exit. */
static void
-decode_field_spec (const char *s, int *file_index, size_t *field_index)
+decode_field_spec (char const *s, int *file_index, size_t *field_index)
{
/* The first character must be 0, 1, or 2. */
switch (s[0])