diff --git a/Makefile.am b/Makefile.am
index 9672de8f5..6eb9c8042 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -66,7 +66,6 @@ mpd_headers = \
 
 src_mpd_SOURCES = \
 	$(mpd_headers) \
-	$(DECODER_SRC) \
 	$(OUTPUT_API_SRC) \
 	$(MIXER_API_SRC) \
 	src/Compiler.h \
@@ -680,8 +679,6 @@ DECODER_LIBS = \
 	$(ADPLUG_LIBS) \
 	$(FAAD_LIBS)
 
-DECODER_SRC =
-
 if HAVE_MAD
 libdecoder_plugins_a_SOURCES += \
 	src/decoder/plugins/MadDecoderPlugin.cxx \