diff --git a/media/libmedia/AudioSystem.cpp b/media/libmedia/AudioSystem.cpp
index f7f129c..84f6b7c 100644
--- a/media/libmedia/AudioSystem.cpp
+++ b/media/libmedia/AudioSystem.cpp
@@ -158,7 +158,7 @@
 
 status_t AudioSystem::setMode(int mode)
 {
-    if (mode >= AUDIO_MODE_CNT) return BAD_VALUE;
+    if (uint32_t(mode) >= AUDIO_MODE_CNT) return BAD_VALUE;
     const sp<IAudioFlinger>& af = AudioSystem::get_audio_flinger();
     if (af == 0) return PERMISSION_DENIED;
     return af->setMode(mode);
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index b238979..9fb666e 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -574,7 +574,7 @@
     if (!settingsAllowed()) {
         return PERMISSION_DENIED;
     }
-    if ((mode < 0) || (mode >= AUDIO_MODE_CNT)) {
+    if (uint32_t(mode) >= AUDIO_MODE_CNT) {
         ALOGW("Illegal value: setMode(%d)", mode);
         return BAD_VALUE;
     }
diff --git a/services/audioflinger/AudioPolicyService.cpp b/services/audioflinger/AudioPolicyService.cpp
index f572fce..3f86d58 100644
--- a/services/audioflinger/AudioPolicyService.cpp
+++ b/services/audioflinger/AudioPolicyService.cpp
@@ -193,7 +193,7 @@
     if (!checkPermission()) {
         return PERMISSION_DENIED;
     }
-    if (state < 0 || state >= AUDIO_MODE_CNT) {
+    if (uint32_t(state) >= AUDIO_MODE_CNT) {
         return BAD_VALUE;
     }