diff --git a/src/uci.cpp b/src/uci.cpp
index 47a8824e..051ff2e0 100644
--- a/src/uci.cpp
+++ b/src/uci.cpp
@@ -277,7 +277,7 @@ void UCI::loop(int argc, char* argv[]) {
       else if (token == "d")        sync_cout << pos << sync_endl;
       else if (token == "eval")     trace_eval(pos);
       else if (token == "compiler") sync_cout << compiler_info() << sync_endl;
-      else
+      else if (!token.empty() && token[0] != '#')
           sync_cout << "Unknown command: " << cmd << sync_endl;
 
   } while (token != "quit" && argc == 1); // Command line args are one-shot