diff --git a/talk/app/webrtc/localaudiosource.cc b/talk/app/webrtc/localaudiosource.cc
index 150c828922..3d4412b3ce 100644
--- a/talk/app/webrtc/localaudiosource.cc
+++ b/talk/app/webrtc/localaudiosource.cc
@@ -51,7 +51,7 @@ void FromConstraints(const MediaConstraintsInterface::Constraints& constraints,
     const char* name;
     cricket::Settable<bool>& value;
   } key_to_value[] = {
-      {MediaConstraintsInterface::kEchoCancellation,
+      {MediaConstraintsInterface::kGoogEchoCancellation,
        options->echo_cancellation},
       // Both kExperimentalEchoCancellation (old) and
       // kExtendedFilterEchoCancellation (new) translate to
diff --git a/talk/app/webrtc/localaudiosource_unittest.cc b/talk/app/webrtc/localaudiosource_unittest.cc
index 1c434203da..7e5d8dea67 100644
--- a/talk/app/webrtc/localaudiosource_unittest.cc
+++ b/talk/app/webrtc/localaudiosource_unittest.cc
@@ -43,7 +43,8 @@ using webrtc::PeerConnectionFactoryInterface;
 
 TEST(LocalAudioSourceTest, SetValidOptions) {
   webrtc::FakeConstraints constraints;
-  constraints.AddMandatory(MediaConstraintsInterface::kEchoCancellation, false);
+  constraints.AddMandatory(
+      MediaConstraintsInterface::kGoogEchoCancellation, false);
   constraints.AddOptional(
       MediaConstraintsInterface::kExtendedFilterEchoCancellation, true);
   constraints.AddOptional(MediaConstraintsInterface::kDAEchoCancellation, true);
@@ -133,8 +134,10 @@ TEST(LocalAudioSourceTest, OptionNotSet) {
 
 TEST(LocalAudioSourceTest, MandatoryOverridesOptional) {
   webrtc::FakeConstraints constraints;
-  constraints.AddMandatory(MediaConstraintsInterface::kEchoCancellation, false);
-  constraints.AddOptional(MediaConstraintsInterface::kEchoCancellation, true);
+  constraints.AddMandatory(
+      MediaConstraintsInterface::kGoogEchoCancellation, false);
+  constraints.AddOptional(
+      MediaConstraintsInterface::kGoogEchoCancellation, true);
 
   rtc::scoped_refptr<LocalAudioSource> source =
       LocalAudioSource::Create(PeerConnectionFactoryInterface::Options(),
diff --git a/talk/app/webrtc/mediaconstraintsinterface.cc b/talk/app/webrtc/mediaconstraintsinterface.cc
index 87f7e66754..99335788f6 100644
--- a/talk/app/webrtc/mediaconstraintsinterface.cc
+++ b/talk/app/webrtc/mediaconstraintsinterface.cc
@@ -48,6 +48,8 @@ const char MediaConstraintsInterface::kMinFrameRate[] = "minFrameRate";
 // Audio constraints.
 const char MediaConstraintsInterface::kEchoCancellation[] =
     "googEchoCancellation";
+const char MediaConstraintsInterface::kGoogEchoCancellation[] =
+    "googEchoCancellation";
 const char MediaConstraintsInterface::kExperimentalEchoCancellation[] =
     "googEchoCancellation2";
 const char MediaConstraintsInterface::kExtendedFilterEchoCancellation[] =
diff --git a/talk/app/webrtc/mediaconstraintsinterface.h b/talk/app/webrtc/mediaconstraintsinterface.h
index 31cc99622f..843bee071c 100644
--- a/talk/app/webrtc/mediaconstraintsinterface.h
+++ b/talk/app/webrtc/mediaconstraintsinterface.h
@@ -73,7 +73,13 @@ class MediaConstraintsInterface {
 
   // Constraint keys used by a local audio source.
   // These keys are google specific.
+  // TODO(tommi): Change kEchoCancellation to be "echoCancellation" once
+  // Chrome has been updated to use kGoogEchoCancellation where the 'goog'
+  // variant is needed.
+  // See https://code.google.com/p/webrtc/issues/detail?id=4747
   static const char kEchoCancellation[];  // googEchoCancellation
+  static const char kGoogEchoCancellation[];  // googEchoCancellation
+
   // TODO(henrik.lundin) Remove kExperimentalEchoCancellation.
   // https://code.google.com/p/webrtc/issues/detail?id=4696
   static const char kExperimentalEchoCancellation[];  // googEchoCancellation2