diff --git a/NanoVNASaver/Hardware/VNA.py b/NanoVNASaver/Hardware/VNA.py
index 1ab29f2..ec1df93 100644
--- a/NanoVNASaver/Hardware/VNA.py
+++ b/NanoVNASaver/Hardware/VNA.py
@@ -104,7 +104,7 @@ class VNA:
     def readFromCommand(self, command) -> str:
         try:
             with self.app.serialLock:
-                drain.serial(self.serial)
+                drain_serial(self.serial)
                 self.serial.write(f"{command}\r".encode('ascii'))
                 result = ""
                 data = ""