diff --git a/tools/nightly22/tts.py b/tools/nightly22/tts.py
index b456367da..5ad157d2c 100755
--- a/tools/nightly22/tts.py
+++ b/tools/nightly22/tts.py
@@ -39,6 +39,8 @@ def generate(str, filename):
         os.system(command.encode('utf-8'))
         command = "sox %s -r 32000 %s" % (output, filename)
         os.system(command.encode('utf-8'))
+        command = "rm -f output.mp3"
+        os.system(command.encode('utf-8'))
 
 ################################################################
 
@@ -84,7 +86,7 @@ if __name__ == "__main__":
 
         directory = "pt"
         voice = "pt-PT"
-        
+
     else:
         print("which language?")
         exit()
diff --git a/tools/release22/tts.py b/tools/release22/tts.py
index 1e683566b..5ad157d2c 100755
--- a/tools/release22/tts.py
+++ b/tools/release22/tts.py
@@ -39,6 +39,8 @@ def generate(str, filename):
         os.system(command.encode('utf-8'))
         command = "sox %s -r 32000 %s" % (output, filename)
         os.system(command.encode('utf-8'))
+        command = "rm -f output.mp3"
+        os.system(command.encode('utf-8'))
 
 ################################################################