diff --git a/src/encoder/plugins/ShineEncoderPlugin.cxx b/src/encoder/plugins/ShineEncoderPlugin.cxx
index 6eb7b0a79..4479d5181 100644
--- a/src/encoder/plugins/ShineEncoderPlugin.cxx
+++ b/src/encoder/plugins/ShineEncoderPlugin.cxx
@@ -91,7 +91,7 @@ public:
 	/* virtual methods from class PreparedEncoder */
 	Encoder *Open(AudioFormat &audio_format) override;
 
-	const char *GetMimeType() const noexcept override {
+	[[nodiscard]] const char *GetMimeType() const noexcept override {
 		return  "audio/mpeg";
 	}
 };