diff --git a/src/decoder/plugins/SidplayDecoderPlugin.cxx b/src/decoder/plugins/SidplayDecoderPlugin.cxx
index 71e530e34..7530be94d 100644
--- a/src/decoder/plugins/SidplayDecoderPlugin.cxx
+++ b/src/decoder/plugins/SidplayDecoderPlugin.cxx
@@ -568,7 +568,6 @@ static const char *const sidplay_suffixes[] = {
 	nullptr
 };
 
-extern const struct DecoderPlugin sidplay_decoder_plugin;
 const struct DecoderPlugin sidplay_decoder_plugin = {
 	"sidplay",
 	sidplay_init,