diff --git a/sohstationviewer/model/reftek/reftek_data/reftek_helper.py b/sohstationviewer/model/reftek/reftek_data/reftek_helper.py
index 465e2b6a9dc3b569b2c36becdadbd6a0666106a6..09fe6ca50e89fa652c971beb9f4ad307badc502f 100644
--- a/sohstationviewer/model/reftek/reftek_data/reftek_helper.py
+++ b/sohstationviewer/model/reftek/reftek_data/reftek_helper.py
@@ -56,7 +56,7 @@ def read_rt130_file(file_name: str, unpacker: Unpacker):
         # when we have finished reading.
         for i in range(os.path.getsize(file_name) // 1024):
             packet = rt130_file.read(1024)
-            packet_header = get_rt130_packet_header(packet, unpacker)
+            packet_header = get_rt130_packet_header(packet)
 
             waveform_handlers: Dict[str, Callable] = {
                 'EH': read_eh_et_packet,