diff --git a/Marlin/src/MarlinCore.cpp b/Marlin/src/MarlinCore.cpp
index a5fcfba6c0..e040c3b26c 100644
--- a/Marlin/src/MarlinCore.cpp
+++ b/Marlin/src/MarlinCore.cpp
@@ -30,6 +30,10 @@
 
 #include "MarlinCore.h"
 
+#if ENABLED(MARLIN_DEV_MODE)
+  #warning "WARNING! Disable MARLIN_DEV_MODE for the final build!"
+#endif
+
 #include "HAL/shared/Delay.h"
 #include "HAL/shared/esp_wifi.h"
 
diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 932cccd9e9..b345147ed9 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -75,10 +75,6 @@
 #endif
 #undef HEXIFY
 
-#if ENABLED(MARLIN_DEV_MODE)
-  #warning "WARNING! Disable MARLIN_DEV_MODE for the final build!"
-#endif
-
 /**
  * Warnings for old configurations
  */