diff --git a/basic_text_to_speech/talk.py b/basic_text_to_speech/talk.py
index f8712bb..0aaccd8 100644
--- a/basic_text_to_speech/talk.py
+++ b/basic_text_to_speech/talk.py
@@ -4,7 +4,7 @@ import os
 
 
 def robot(text):
-    os.system("espeak --stdin '" + text + "' | aplay -D plughw:2,0 ")
+    os.system('espeak --stdin "' + text + '" | aplay -D plughw:2,0 ')
 
 
 if __name__ == '__main__':