diff --git a/media/libeffects/preprocessing/PreProcessing.cpp b/media/libeffects/preprocessing/PreProcessing.cpp
index 5709837..597866a 100755
--- a/media/libeffects/preprocessing/PreProcessing.cpp
+++ b/media/libeffects/preprocessing/PreProcessing.cpp
@@ -517,6 +517,10 @@
     webrtc::EchoControlMobile *aec = static_cast<webrtc::EchoControlMobile *>(effect->engine);
     webrtc::EchoControlMobile::RoutingMode mode = webrtc::EchoControlMobile::kQuietEarpieceOrHeadset;
 
+    if (audio_is_input_device(device)) {
+        return 0;
+    }
+
     switch(device) {
     case AUDIO_DEVICE_OUT_EARPIECE:
         mode = webrtc::EchoControlMobile::kEarpiece;