1 files changed, 2 insertions, 1 deletions
diff --git a/alc/backends/portaudio.cpp b/alc/backends/portaudio.cpp
index 1e3d0ce8..5de9ab58 100644
--- a/alc/backends/portaudio.cpp
+++ b/alc/backends/portaudio.cpp
@@ -110,7 +110,8 @@ int PortPlayback::writeCallback(const void*, void *outputBuffer, unsigned long f
     const PaStreamCallbackTimeInfo*, const PaStreamCallbackFlags) noexcept
 {
     std::lock_guard<PortPlayback> _{*this};
-    aluMixData(mDevice, outputBuffer, static_cast<ALuint>(framesPerBuffer));
+    aluMixData(mDevice, outputBuffer, static_cast<ALuint>(framesPerBuffer),
+        mDevice->channelsFromFmt());
     return 0;
 }