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diff --git a/Marlin/src/gcode/units/M149.cpp b/Marlin/src/gcode/units/M149.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(TEMPERATURE_UNITS_SUPPORT)
+
+#include "../gcode.h"
+
+/**
+ * M149: Set temperature units
+ */
+void GcodeSuite::M149() {
+       if (parser.seenval('C')) parser.set_input_temp_units(TEMPUNIT_C);
+  else if (parser.seenval('K')) parser.set_input_temp_units(TEMPUNIT_K);
+  else if (parser.seenval('F')) parser.set_input_temp_units(TEMPUNIT_F);
+}
+
+#endif // TEMPERATURE_UNITS_SUPPORT