diff --git a/xy2-100-bsl/pd.py b/xy2-100-bsl/pd.py
index 3388299..ee67504 100644
--- a/xy2-100-bsl/pd.py
+++ b/xy2-100-bsl/pd.py
@@ -232,7 +232,7 @@ class Decoder(srd.Decoder):
 
     def decode(self):
         if self.filename != "":
-            self.file = open(self.filename,'a')  
+            self.file = open(self.filename,'w')  
             self.file.write('x,y,z\n')
         bit_ss = None
         bit_value = 0