diff --git a/media/libnbaio/AudioStreamInSource.cpp b/media/libnbaio/AudioStreamInSource.cpp
index af8f365..6aab48a 100644
--- a/media/libnbaio/AudioStreamInSource.cpp
+++ b/media/libnbaio/AudioStreamInSource.cpp
@@ -46,7 +46,8 @@
         uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common);
         audio_channel_mask_t channelMask =
                 (audio_channel_mask_t) mStream->common.get_channels(&mStream->common);
-        mFormat = Format_from_SR_C(sampleRate, popcount(channelMask), streamFormat);
+        mFormat = Format_from_SR_C(sampleRate,
+                audio_channel_count_from_in_mask(channelMask), streamFormat);
         mFrameSize = Format_frameSize(mFormat);
     }
     return NBAIO_Source::negotiate(offers, numOffers, counterOffers, numCounterOffers);