diff --git a/Marlin/src/gcode/gcode.cpp b/Marlin/src/gcode/gcode.cpp
index 3a24f62479ae..441642527027 100644
--- a/Marlin/src/gcode/gcode.cpp
+++ b/Marlin/src/gcode/gcode.cpp
@@ -277,8 +277,6 @@ void GcodeSuite::process_parsed_command(
       #if ENABLED(DEBUG_GCODE_PARSER)
         case 800: parser.debug(); break;                          // G800: GCode Parser Test for G
       #endif
-
-      default: parser.unknown_command_error(); break;
     }
     break;
 
@@ -657,8 +655,6 @@ void GcodeSuite::process_parsed_command(
       #endif
 
       case 999: M999(); break;                                    // M999: Restart after being Stopped
-
-      default: parser.unknown_command_error(); break;
     }
     break;