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diff --git a/Marlin/src/feature/repeat.cpp b/Marlin/src/feature/repeat.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(GCODE_REPEAT_MARKERS)
+
+//#define DEBUG_GCODE_REPEAT_MARKERS
+
+#include "repeat.h"
+
+#include "../gcode/gcode.h"
+#include "../sd/cardreader.h"
+
+#define DEBUG_OUT ENABLED(DEBUG_GCODE_REPEAT_MARKERS)
+#include "../core/debug_out.h"
+
+repeat_marker_t Repeat::marker[MAX_REPEAT_NESTING];
+uint8_t Repeat::index;
+
+void Repeat::add_marker(const uint32_t sdpos, const uint16_t count) {
+  if (index >= MAX_REPEAT_NESTING)
+    SERIAL_ECHO_MSG("!Too many markers.");
+  else {
+    marker[index].sdpos = sdpos;
+    marker[index].counter = count ?: -1;
+    index++;
+    DEBUG_ECHOLNPAIR("Add Marker ", int(index), " at ", sdpos, " (", count, ")");
+  }
+}
+
+void Repeat::loop() {
+  if (!index)                           // No marker?
+    SERIAL_ECHO_MSG("!No marker set."); //  Inform the user.
+  else {
+    const uint8_t ind = index - 1;      // Active marker's index
+    if (!marker[ind].counter) {         // Did its counter run out?
+      DEBUG_ECHOLNPAIR("Pass Marker ", int(index));
+      index--;                          //  Carry on. Previous marker on the next 'M808'.
+    }
+    else {
+      card.setIndex(marker[ind].sdpos); // Loop back to the marker.
+      if (marker[ind].counter > 0)      // Ignore a negative (or zero) counter.
+        --marker[ind].counter;          // Decrement the counter. If zero this 'M808' will be skipped next time.
+      DEBUG_ECHOLNPAIR("Goto Marker ", int(index), " at ", marker[ind].sdpos, " (", marker[ind].counter, ")");
+    }
+  }
+}
+
+void Repeat::cancel() { LOOP_L_N(i, index) marker[i].counter = 0; }
+
+void Repeat::early_parse_M808(char * const cmd) {
+  if (is_command_M808(cmd)) {
+    DEBUG_ECHOLNPAIR("Parsing \"", cmd, "\"");
+    parser.parse(cmd);
+    if (parser.seen('L'))
+      add_marker(card.getIndex(), parser.value_ushort());
+    else
+      Repeat::loop();
+  }
+}
+
+#endif // GCODE_REPEAT_MARKERS