diff --git a/speech-to-text/src/main/java/com/ibm/watson/developer_cloud/speech_to_text/v1/websocket/SpeechToTextWebSocketListener.java b/speech-to-text/src/main/java/com/ibm/watson/developer_cloud/speech_to_text/v1/websocket/SpeechToTextWebSocketListener.java
index <HASH>..<HASH> 100755
--- a/speech-to-text/src/main/java/com/ibm/watson/developer_cloud/speech_to_text/v1/websocket/SpeechToTextWebSocketListener.java
+++ b/speech-to-text/src/main/java/com/ibm/watson/developer_cloud/speech_to_text/v1/websocket/SpeechToTextWebSocketListener.java
@@ -55,7 +55,7 @@ public final class SpeechToTextWebSocketListener extends WebSocketListener {
   private static final String RESULTS = "results";
   private static final String SPEAKER_LABELS = "speaker_labels";
   private static final String CUSTOMIZATION_ID = "customization_id";
-  private static final String LANGUAGE_CUSTOMIZATION_ID = "customization_id";
+  private static final String LANGUAGE_CUSTOMIZATION_ID = "language_customization_id";
   private static final String ACOUSTIC_CUSTOMIZATION_ID = "acoustic_customization_id";
   private static final String CUSTOMIZATION_WEIGHT = "customization_weight";
   private static final String VERSION = "base_model_version";
fix(Speech to Text): Fix value of language customization ID property in WebSocket listener