diff --git a/src/network/transportsender.cc b/src/network/transportsender.cc
index 9d04b64..5a4b58a 100644
--- a/src/network/transportsender.cc
+++ b/src/network/transportsender.cc
@@ -157,7 +157,7 @@ void TransportSender<MyState>::tick( void )
     MyState newstate( assumed_receiver_state->state );
     newstate.apply_string( diff );
     if ( current_state.compare( newstate ) ) {
-      fprintf( stderr, "Diff: %s\n", diff.c_str() );
+      fprintf( stderr, "Warning, round-trip Instruction verification failed!\n" );
     }
   }
 
diff --git a/src/terminal/terminalframebuffer.cc b/src/terminal/terminalframebuffer.cc
index da790af..a71ec34 100644
--- a/src/terminal/terminalframebuffer.cc
+++ b/src/terminal/terminalframebuffer.cc
@@ -589,8 +589,7 @@ bool Cell::compare( const Cell &other ) const
 
   if ( !(renditions == other.renditions) ) {
     ret = true;
-    fprintf( stderr, "renditions: %s vs. %s\n",
-	     renditions.sgr().c_str(), other.renditions.sgr().c_str() );
+    fprintf( stderr, "renditions differ\n" );
   }
 
   if ( wrap != other.wrap ) {