diff --git a/src/util/disk_cache_os.c b/src/util/disk_cache_os.c
index b087cd5401f..9de004e99e5 100644
--- a/src/util/disk_cache_os.c
+++ b/src/util/disk_cache_os.c
@@ -52,8 +52,7 @@ write_all(int fd, const void *buf, size_t count);
  * of the data written to disk.
  */
 static size_t
-deflate_and_write_to_disk(const void *in_data, size_t in_data_size, int dest,
-                          const char *filename)
+deflate_and_write_to_disk(const void *in_data, size_t in_data_size, int dest)
 {
 #ifdef HAVE_ZSTD
    /* from the zstd docs (https://facebook.github.io/zstd/zstd_manual.html):
@@ -765,7 +764,7 @@ disk_cache_write_item_to_disk(struct disk_cache_put_job *dc_job,
     * perform an atomic increment of the total cache size.
     */
    size_t file_size = deflate_and_write_to_disk(dc_job->data, dc_job->size,
-                                                fd, filename_tmp);
+                                                fd);
    if (file_size == 0) {
       unlink(filename_tmp);
       goto done;