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-rw-r--r--diff-delta.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/diff-delta.c b/diff-delta.c
index 1188b31cd0..5bc22047f8 100644
--- a/diff-delta.c
+++ b/diff-delta.c
@@ -131,8 +131,8 @@ static struct index ** delta_index(const unsigned char *buf,
/* the maximum size for any opcode */
#define MAX_OP_SIZE COPYOP_SIZE(0xffffffff, 0xffffffff)
-void *diff_delta(void *from_buf, unsigned long from_size,
- void *to_buf, unsigned long to_size,
+void *diff_delta(const void *from_buf, unsigned long from_size,
+ const void *to_buf, unsigned long to_size,
unsigned long *delta_size,
unsigned long max_size)
{