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--- a/mpd2src/wavreader.h
+++ b/mpd2src/wavreader.h
@@ -44,7 +44,7 @@
 
     // Get pointer to data at offset. Caller is supposed to know how
     // much there is ahead.
-    const unsigned char *data(size_t size);
+    const unsigned char *data(size_t size, ssize_t &nread);
 
     unsigned int subChunk2Size() {
         return m_subChunk2Size;