diff --git a/test/StreamConverter_test.py b/test/StreamConverter_test.py
index 0c8b4207ac380f9d27efb5c526d24f9703dcec78..446a4b553340a1646d9344602cdcf7c478a4a096 100644
--- a/test/StreamConverter_test.py
+++ b/test/StreamConverter_test.py
@@ -362,6 +362,7 @@ def __create_trace(channel, data, decbase=0):
     stats = obspy.core.Stats()
     stats.starttime = STARTTIME
     stats.delta = 60
+    stats.npts = len(data)
     stats.declination_base = decbase
     stats.channel = channel
     numpy_data = numpy.array(data, dtype=numpy.float64)