diff --git a/modules/juce_audio_devices/native/juce_emscripten_Audio.cpp b/modules/juce_audio_devices/native/juce_emscripten_Audio.cpp
index 7a1e2e1cf..4f1d0a573 100644
--- a/modules/juce_audio_devices/native/juce_emscripten_Audio.cpp
+++ b/modules/juce_audio_devices/native/juce_emscripten_Audio.cpp
@@ -359,12 +359,12 @@ class OpenALAudioIODevice : public AudioIODevice
     BigInteger getActiveOutputChannels () const override
     {
         BigInteger b;
-        b.setRange (0, numIn, true);
+        b.setRange (0, numOut, true);
         return b;
     }
     BigInteger getActiveInputChannels () const override {
         BigInteger b;
-        b.setRange (0, numOut, true);
+        b.setRange (0, numIn, true);
         return b;
     }