diff --git a/Marlin/src/HAL/NATIVE_SIM/pinsDebug.cpp b/Marlin/src/HAL/NATIVE_SIM/pinsDebug.cpp
new file mode 100644
index 0000000000..e75826c58a
--- /dev/null
+++ b/Marlin/src/HAL/NATIVE_SIM/pinsDebug.cpp
@@ -0,0 +1,45 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2021 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * 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/>.
+ *
+ */
+
+#ifdef __PLAT_NATIVE_SIM__
+
+#include "../../inc/MarlinConfig.h"
+#include "pinsDebug.h"
+
+int8_t ADC_pin_mode(pin_t pin) { return -1; }
+
+int8_t get_pin_mode(const pin_t pin) { return VALID_PIN(pin) ? 0 : -1; }
+
+bool GET_PINMODE(const pin_t pin) {
+  const int8_t pin_mode = get_pin_mode(pin);
+  if (pin_mode == -1 || pin_mode == ADC_pin_mode(pin)) // Invalid pin or active analog pin
+    return false;
+
+  return (Gpio::getMode(pin) != 0); // Input/output state
+}
+
+bool GET_ARRAY_IS_DIGITAL(const pin_t pin) {
+  return !IS_ANALOG(pin) || get_pin_mode(pin) != ADC_pin_mode(pin);
+}
+
+void print_port(const pin_t) {}
+void pwm_details(const pin_t) {}
+bool pwm_status(const pin_t) { return false; }
+
+#endif
diff --git a/Marlin/src/HAL/NATIVE_SIM/pinsDebug.h b/Marlin/src/HAL/NATIVE_SIM/pinsDebug.h
index 9c53b4b0d9..28821acbd0 100644
--- a/Marlin/src/HAL/NATIVE_SIM/pinsDebug.h
+++ b/Marlin/src/HAL/NATIVE_SIM/pinsDebug.h
@@ -36,22 +36,10 @@
 #define MULTI_NAME_PAD 16 // space needed to be pretty if not first name assigned to a pin
 
 // Active ADC function/mode/code values for PINSEL registers
-constexpr int8_t ADC_pin_mode(pin_t pin) { return -1; }
-
-int8_t get_pin_mode(const pin_t pin) { return VALID_PIN(pin) ? 0 : -1; }
-
-bool GET_PINMODE(const pin_t pin) {
-  const int8_t pin_mode = get_pin_mode(pin);
-  if (pin_mode == -1 || pin_mode == ADC_pin_mode(pin)) // Invalid pin or active analog pin
-    return false;
-
-  return (Gpio::getMode(pin) != 0); // Input/output state
-}
-
-bool GET_ARRAY_IS_DIGITAL(const pin_t pin) {
-  return !IS_ANALOG(pin) || get_pin_mode(pin) != ADC_pin_mode(pin);
-}
-
-void print_port(const pin_t) {}
-void pwm_details(const pin_t) {}
-bool pwm_status(const pin_t) { return false; }
+int8_t ADC_pin_mode(pin_t pin);
+int8_t get_pin_mode(const pin_t pin);
+bool GET_PINMODE(const pin_t pin);
+bool GET_ARRAY_IS_DIGITAL(const pin_t pin);
+void print_port(const pin_t);
+void pwm_details(const pin_t);
+bool pwm_status(const pin_t);