diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 077447f..46969ef 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2897,8 +2897,8 @@
         (void)posix_memalign(&mEffectBuffer, 32, mEffectBufferSize);
     }
 
-    mHapticChannelMask = mChannelMask & AUDIO_CHANNEL_HAPTIC_ALL;
-    mChannelMask &= ~mHapticChannelMask;
+    mHapticChannelMask = static_cast<audio_channel_mask_t>(mChannelMask & AUDIO_CHANNEL_HAPTIC_ALL);
+    mChannelMask = static_cast<audio_channel_mask_t>(mChannelMask & ~mHapticChannelMask);
     mHapticChannelCount = audio_channel_count_from_out_mask(mHapticChannelMask);
     mChannelCount -= mHapticChannelCount;
 
@@ -4247,7 +4247,7 @@
                             "Enumerated device type(%#x) must not be used "
                             "as it does not support audio patches",
                             patch->sinks[i].ext.device.type);
-        type |= patch->sinks[i].ext.device.type;
+        type = static_cast<audio_devices_t>(type | patch->sinks[i].ext.device.type);
         deviceTypeAddrs.push_back(AudioDeviceTypeAddr(patch->sinks[i].ext.device.type,
                 patch->sinks[i].ext.device.address));
     }
@@ -4497,8 +4497,9 @@
         // wrap the source side of the MonoPipe to make it an AudioBufferProvider
         fastTrack->mBufferProvider = new SourceAudioBufferProvider(new MonoPipeReader(monoPipe));
         fastTrack->mVolumeProvider = NULL;
-        fastTrack->mChannelMask = mChannelMask | mHapticChannelMask; // mPipeSink channel mask for
-                                                                     // audio to FastMixer
+        fastTrack->mChannelMask = static_cast<audio_channel_mask_t>(
+                mChannelMask | mHapticChannelMask); // mPipeSink channel mask for
+                                                    // audio to FastMixer
         fastTrack->mFormat = mFormat; // mPipeSink format for audio to FastMixer
         fastTrack->mHapticPlaybackEnabled = mHapticChannelMask != AUDIO_CHANNEL_NONE;
         fastTrack->mHapticIntensity = os::HapticScale::NONE;
@@ -4512,7 +4513,8 @@
         // specify sink channel mask when haptic channel mask present as it can not
         // be calculated directly from channel count
         state->mSinkChannelMask = mHapticChannelMask == AUDIO_CHANNEL_NONE
-                ? AUDIO_CHANNEL_NONE : mChannelMask | mHapticChannelMask;
+                ? AUDIO_CHANNEL_NONE
+                : static_cast<audio_channel_mask_t>(mChannelMask | mHapticChannelMask);
         state->mCommand = FastMixerState::COLD_IDLE;
         // already done in constructor initialization list
         //mFastMixerFutex = 0;
@@ -9242,7 +9244,7 @@
                                 "Enumerated device type(%#x) must not be used "
                                 "as it does not support audio patches",
                                 patch->sinks[i].ext.device.type);
-            type |= patch->sinks[i].ext.device.type;
+            type = static_cast<audio_devices_t>(type | patch->sinks[i].ext.device.type);
             sinkDeviceTypeAddrs.push_back(AudioDeviceTypeAddr(patch->sinks[i].ext.device.type,
                     patch->sinks[i].ext.device.address));
         }