diff --git a/Marlin/src/gcode/gcode_d.cpp b/Marlin/src/gcode/gcode_d.cpp
index 74277291e..a8a6bdfc3 100644
--- a/Marlin/src/gcode/gcode_d.cpp
+++ b/Marlin/src/gcode/gcode_d.cpp
@@ -216,7 +216,8 @@
         } break;
 
         case 102: { // D102 Test SD Read
-          card.openFileRead("test.gco");
+          char testfile[] = "test.gco";
+          card.openFileRead(testfile);
           if (!card.isFileOpen()) {
             SERIAL_ECHOLNPAIR("Failed to open test.gco to read.");
             return;