--- gexiv2/gexiv2-stream-io.h~	2017-05-07 19:14:31.243531627 +0000
+++ gexiv2/gexiv2-stream-io.h	2017-05-07 19:20:39.344439242 +0000
@@ -39,7 +39,7 @@
 	virtual Exiv2::byte* mmap (bool isWriteable = false);
 	virtual int munmap ();
 	virtual long tell () const;
-	virtual long size () const;
+	virtual size_t size () const;
 	virtual bool isopen () const;
 	virtual int error () const;
 	virtual bool eof () const;
--- gexiv2/gexiv2-stream-io.cpp~	2017-05-07 19:12:57.090555257 +0000
+++ gexiv2/gexiv2-stream-io.cpp	2017-05-07 19:22:41.042408694 +0000
@@ -142,7 +142,7 @@
     return cb->Position (cb->handle);
 }
 
-long StreamIo::size () const {
+size_t StreamIo::size () const {
     return cb->Length (cb->handle);
 }