diff --git a/speech_recognition/__init__.py b/speech_recognition/__init__.py
index 78765c07..05ab1171 100644
--- a/speech_recognition/__init__.py
+++ b/speech_recognition/__init__.py
@@ -958,7 +958,7 @@ def recognize_google_cloud(self, audio_data, credentials_json=None, language="en
 
         speech_config = {"encoding": "FLAC", "sampleRateHertz": audio_data.sample_rate, "languageCode": language}
         if preferred_phrases is not None:
-            speech_config["speechContext"] = {"phrases": preferred_phrases}
+            speech_config["speechContexts"] = [{"phrases": preferred_phrases}]
         if show_all:
             speech_config["enableWordTimeOffsets"] = True  # some useful extra options for when we want all the output
         request = speech_service.speech().recognize(body={"audio": {"content": base64.b64encode(flac_data).decode("utf8")}, "config": speech_config})