1 files changed, 1 insertions, 1 deletions
diff --git a/src/util.h b/src/util.h
index 8802c81d..d75ba795 100644
--- a/src/util.h
+++ b/src/util.h
@@ -56,7 +56,7 @@ extern ContentKind content_kind_from_string (std::string kind);
 extern bool empty_or_white_space (std::string s);
 extern boost::shared_ptr<OpenJPEGImage> decompress_j2k (uint8_t* data, int64_t size, int reduce);
 extern boost::shared_ptr<OpenJPEGImage> decompress_j2k (Data data, int reduce);
-extern Data compress_j2k (boost::shared_ptr<OpenJPEGImage>, int bandwith, int frames_per_second, bool threed, bool fourk);
+extern Data compress_j2k (boost::shared_ptr<const OpenJPEGImage>, int bandwith, int frames_per_second, bool threed, bool fourk);
 extern bool ids_equal (std::string a, std::string b);
 
 extern void init ();