diff --git a/src/sfizz/FilePool.cpp b/src/sfizz/FilePool.cpp
index d33689c0..a7f6e893 100644
--- a/src/sfizz/FilePool.cpp
+++ b/src/sfizz/FilePool.cpp
@@ -207,7 +207,7 @@ absl::optional<sfz::FileInformation> sfz::FilePool::getFileInformation(const Fil
     const unsigned channels = reader->channels();
 
     if (channels != 1 && channels != 2) {
-        DBG("[sfizz] Missing logic for " << sndFile.channels() << " channels, discarding sample " << fileId);
+        DBG("[sfizz] Missing logic for " << reader->channels() << " channels, discarding sample " << fileId);
         return {};
     }
 
@@ -398,7 +398,7 @@ void sfz::FilePool::loadingThread() noexcept
         std::error_code readError;
         AudioReaderPtr reader = createAudioReader(file, promise->fileId.isReverse(), &readError);
         if (readError) {
-            DBG("[sfizz] libsndfile errored for " << promise->fileId << " with message " << readError.what());
+            DBG("[sfizz] libsndfile errored for " << promise->fileId << " with message " << readError.message());
             promise->dataStatus = FilePromise::DataStatus::Error;
             continue;
         }
diff --git a/src/sfizz/Oversampler.cpp b/src/sfizz/Oversampler.cpp
index 67de1c30..8476ff34 100644
--- a/src/sfizz/Oversampler.cpp
+++ b/src/sfizz/Oversampler.cpp
@@ -139,8 +139,8 @@ void sfz::Oversampler::stream(AudioSpan<float> input, AudioSpan<float> output, s
 
 void sfz::Oversampler::stream(AudioReader& input, AudioSpan<float> output, std::atomic<size_t>* framesReady)
 {
-    ASSERT(output.getNumFrames() >= input.getNumFrames() * static_cast<int>(factor));
-    ASSERT(output.getNumChannels() == input.getNumChannels());
+    ASSERT(output.getNumFrames() >= input.frames() * static_cast<int>(factor));
+    ASSERT(output.getNumChannels() == input.channels());
 
     const auto numFrames = static_cast<size_t>(input.frames());
     const auto numChannels = input.channels();