diff --git a/src/shared/file_send.c b/src/shared/file_send.c
index 18a1f27..8da018a 100644
--- a/src/shared/file_send.c
+++ b/src/shared/file_send.c
@@ -22,7 +22,7 @@
  * frame: the destination path, the metadata frame (whose mode's S_IFMT bits
  * carry the node kind) and the device rdev major/minor.  The receiver validates
  * the kind and rdev and recreates the node (privilege-gating the mknod). */
-bool file_send_special(File* file, int file_descriptor, bool use_metadata) {
+bool file_send_special(const File* file, int file_descriptor, bool use_metadata) {
   if (!file || !file_wire_path(file))
     return false;
   if (!send_status(file_descriptor, STATUS_SPECIAL))
diff --git a/src/shared/file_send.h b/src/shared/file_send.h
index 183394e..b48d33c 100644
--- a/src/shared/file_send.h
+++ b/src/shared/file_send.h
@@ -6,7 +6,7 @@
 
 /* Client-side file send path. */
 
-bool file_send_special(File* file, int file_descriptor, bool use_metadata);
+bool file_send_special(const File* file, int file_descriptor, bool use_metadata);
 bool file_send_single_calls(File* file, int file_descriptor, bool use_metadata,
                             int compression_level, bool send_path);
 bool file_send_single_calls_with_skip(File* file, int file_descriptor, bool use_metadata,
diff --git a/tests/test_chunk.c b/tests/test_chunk.c
index 3d239cf..b1d6cf6 100644
--- a/tests/test_chunk.c
+++ b/tests/test_chunk.c
@@ -273,9 +273,8 @@ static void test_chunk_special_rdev_out_of_range_rejected() {
   EXPECT_NOT_NULL(chunk);
   Data* serialized = chunk_serialize(chunk, true);
   EXPECT_NOT_NULL(serialized);
-  Chunk* deserialized = chunk_deserialize(serialized, true);
+  const Chunk* deserialized = chunk_deserialize(serialized, true);
   EXPECT_NULL(deserialized);
-
   data_destroy(serialized);
   chunk_destroy(chunk);
 }