diff --git a/src/decoder/DecoderAPI.cxx b/src/decoder/DecoderAPI.cxx
index 3758a922e..62b2065bf 100644
--- a/src/decoder/DecoderAPI.cxx
+++ b/src/decoder/DecoderAPI.cxx
@@ -30,7 +30,6 @@
 #include "DecoderInternal.hxx"
 #include "DetachedSong.hxx"
 #include "input/InputStream.hxx"
-#include "util/Error.hxx"
 #include "util/ConstBuffer.hxx"
 #include "Log.hxx"
 
diff --git a/src/decoder/DecoderAPI.hxx b/src/decoder/DecoderAPI.hxx
index 1433e5fd4..d400dbda2 100644
--- a/src/decoder/DecoderAPI.hxx
+++ b/src/decoder/DecoderAPI.hxx
@@ -44,8 +44,6 @@
 
 #include <stdint.h>
 
-class Error;
-
 /**
  * Throw an instance of this class to stop decoding the current song
  * (successfully).  It can be used to jump out of all of a decoder's