diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 0c8b3ce..3e4c55e 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -93,8 +93,12 @@
 
 effect_descriptor_t AudioMixer::dwnmFxDesc;
 
+// Ensure mConfiguredNames bitmask is initialized properly on all architectures.
+// The value of 1 << x is undefined in C when x >= 32.
+
 AudioMixer::AudioMixer(size_t frameCount, uint32_t sampleRate, uint32_t maxNumTracks)
-    :   mTrackNames(0), mConfiguredNames((1 << maxNumTracks) - 1), mSampleRate(sampleRate)
+    :   mTrackNames(0), mConfiguredNames((maxNumTracks >= 32 ? 0 : 1 << maxNumTracks) - 1),
+        mSampleRate(sampleRate)
 {
     // AudioMixer is not yet capable of multi-channel beyond stereo
     COMPILE_TIME_ASSERT_FUNCTION_SCOPE(2 == MAX_NUM_CHANNELS);