diff --git a/texttospeech/cloud-client/requirements.txt b/texttospeech/cloud-client/requirements.txt
index 0cd0886a375..ccf0a4d5e1b 100644
--- a/texttospeech/cloud-client/requirements.txt
+++ b/texttospeech/cloud-client/requirements.txt
@@ -1 +1,2 @@
+future==0.18.2
 google-cloud-texttospeech==0.5.0
diff --git a/texttospeech/cloud-client/synthesize_text.py b/texttospeech/cloud-client/synthesize_text.py
index d5886bd16f1..768c0da0317 100644
--- a/texttospeech/cloud-client/synthesize_text.py
+++ b/texttospeech/cloud-client/synthesize_text.py
@@ -36,6 +36,7 @@ def synthesize_text(text):
     # Names of voices can be retrieved with client.list_voices().
     voice = texttospeech.types.VoiceSelectionParams(
         language_code='en-US',
+        name='en-US-Standard-C',
         ssml_gender=texttospeech.enums.SsmlVoiceGender.FEMALE)
 
     audio_config = texttospeech.types.AudioConfig(
@@ -68,6 +69,7 @@ def synthesize_ssml(ssml):
     # Names of voices can be retrieved with client.list_voices().
     voice = texttospeech.types.VoiceSelectionParams(
         language_code='en-US',
+        name='en-US-Standard-C',
         ssml_gender=texttospeech.enums.SsmlVoiceGender.FEMALE)
 
     audio_config = texttospeech.types.AudioConfig(