diff --git a/apps/grgsm_decode b/apps/grgsm_decode
index 034014e..d754fc7 100755
--- a/apps/grgsm_decode
+++ b/apps/grgsm_decode
@@ -30,6 +30,7 @@ import collections
 import grgsm
 import pmt
 import socket
+import sys
 
 
 class grgsm_decoder(gr.top_block):
@@ -368,7 +369,7 @@ if __name__ == '__main__':
         parser.error("Invalid A5 version\n")
 
     if options.cfile and (options.fc is None and options.arfcn is None):
-        print("You haven't provided a frequency or an ARFCN - working without automatic frequency offset correction.\n")
+        print("You haven't provided a frequency or an ARFCN - working without automatic frequency offset correction.\n", file=sys.stderr)
 
     # handle frequency / arfcn input
     arfcn = None