diff --git a/platformio.ini b/platformio.ini
index da08d2d14a..ae08ee9335 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -19,6 +19,7 @@
 src_dir      = Marlin
 boards_dir   = buildroot/share/PlatformIO/boards
 default_envs = mega2560
+include_dir  = Marlin
 
 #
 # The 'common' values are used for most Marlin builds