diff --git a/src/DSP/AudioFile.hpp b/src/DSP/AudioFile.hpp
index 0e18da5..b923ee0 100644
--- a/src/DSP/AudioFile.hpp
+++ b/src/DSP/AudioFile.hpp
@@ -9,6 +9,9 @@ namespace ta
 template<typename ExpectedFormat>
 auto fileHasFormat(juce::AudioFormatManager& formatManager, juce::File const& file) -> bool
 {
+    static_assert(std::is_base_of<juce::AudioFormat, ExpectedFormat>::value,
+                  "ExpectedFormat must be a subclass of AudioFormat");
+
     auto reader = std::unique_ptr<juce::AudioFormatReader>(formatManager.createReaderFor(file));
     if (reader == nullptr) { return false; }
     return dynamic_cast<ExpectedFormat*>(reader.get()) != nullptr;
diff --git a/src/DSP/AudioFileConverter.hpp b/src/DSP/AudioFileConverter.hpp
index 6e0428d..ed28f28 100644
--- a/src/DSP/AudioFileConverter.hpp
+++ b/src/DSP/AudioFileConverter.hpp
@@ -49,7 +49,8 @@ inline auto AudioFileConverter::convert(Options const& options) -> Result
     auto writer = std::unique_ptr<juce::AudioFormatWriter>(format.createWriterFor(out.get(), sr, ch, bits, {}, 0));
 
     if (writer == nullptr) { return Result{false, "Failed to convert to wav"}; }
-    out.release();  // writer took ownership
+    auto* p = out.release();  // writer took ownership
+    (void)p;                  // fixes nodiscard warning on release
 
     writer->writeFromAudioReader(*reader, 0, reader->lengthInSamples);
     writer->flush();