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-rw-r--r--src/comm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/comm.c b/src/comm.c
index 7434cc87a..2e069d659 100644
--- a/src/comm.c
+++ b/src/comm.c
@@ -95,7 +95,7 @@ Compare sorted files LEFT_FILE and RIGHT_FILE line by line.\n\
2 for a line only in file 2, 3 for a line in both. */
static void
-writeline (struct linebuffer *line, FILE *stream, int class)
+writeline (const struct linebuffer *line, FILE *stream, int class)
{
switch (class)
{