diff --git a/pySim-shell.py b/pySim-shell.py
index be1d783b..2d9d3567 100755
--- a/pySim-shell.py
+++ b/pySim-shell.py
@@ -210,8 +210,10 @@ Online manual available at https://downloads.osmocom.org/docs/pysim/master/html/
         def __init__(self, cmd2_app):
             self.cmd2 = cmd2_app
 
-        def trace_response(self, cmd, sw, resp):
+        def trace_command(self, cmd):
             self.cmd2.poutput("-> %s %s" % (cmd[:10], cmd[10:]))
+
+        def trace_response(self, cmd, sw, resp):
             self.cmd2.poutput("<- %s: %s" % (sw, resp))
 
     def update_prompt(self):
diff --git a/pySim/transport/__init__.py b/pySim/transport/__init__.py
index 5a630c81..f99fd89e 100644
--- a/pySim/transport/__init__.py
+++ b/pySim/transport/__init__.py
@@ -45,8 +45,10 @@ class ApduTracer:
 
 class StdoutApduTracer(ApduTracer):
     """Minimalistic APDU tracer, printing commands to stdout."""
-    def trace_response(self, cmd, sw, resp):
+    def trace_command(self, cmd):
         log.info("-> %s %s", cmd[:10], cmd[10:])
+
+    def trace_response(self, cmd, sw, resp):
         log.info("<- %s: %s", sw, resp)
 
     def trace_reset(self):