diff --git a/python/villas/node/communicate.py b/python/villas/node/communicate.py
index 0a2a0c8ed..91996e098 100644
--- a/python/villas/node/communicate.py
+++ b/python/villas/node/communicate.py
@@ -57,6 +57,7 @@ class SendThread(Thread):
             sample = Sample(ts, values)
 
             sys.stdout.write(str(sample) + '\n')
+            sys.stdout.flush()
 
             self.sequence += 1