diff --git a/beat/backend/python/data.py b/beat/backend/python/data.py
index 1bebc24444c25c81176faf7377cc90e764918811..0f9cda93909a1ac5777a57c4b3cfd22d8caba75a 100755
--- a/beat/backend/python/data.py
+++ b/beat/backend/python/data.py
@@ -823,9 +823,9 @@ class StdoutDataSink(DataSink):
         """
 
         if self.display_data:
-            print '%s(%d -> %d): %s' % (self.prefix, start_data_index, end_data_index, str(data))
+            print('%s(%d -> %d): %s' % (self.prefix, start_data_index, end_data_index, str(data)))
         else:
-            print '%s(%d -> %d): <data>' % (self.prefix, start_data_index, end_data_index)
+            print('%s(%d -> %d): <data>' % (self.prefix, start_data_index, end_data_index))
 
 
     def isConnected(self):