diff --git a/gqrxHandler.py b/gqrxHandler.py
index 0a9ee86..5b81844 100644
--- a/gqrxHandler.py
+++ b/gqrxHandler.py
@@ -19,7 +19,7 @@ class GQRXHandler():
     def change_freq(self, freq):
         print(f"Changing freq to {freq}")
         self.tel_conn.write(bytes(f"F {int(freq)}", 'utf-8'))
-        self.tel_conn.read_until('RPRT 0')
+        self.tel_conn.read_until(b'RPRT 0')
 
     def change_squelch(self, squelch):
         if not check_negative(squelch):