diff --git a/Marlin/src/core/debug_out.h b/Marlin/src/core/debug_out.h
index 25682a601c..07bdad7ff2 100644
--- a/Marlin/src/core/debug_out.h
+++ b/Marlin/src/core/debug_out.h
@@ -19,7 +19,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  */
-#pragma once
 
 //
 // Serial aliases for debugging.