diff --git a/platformio.ini b/platformio.ini
index 9a879365e..2b71e7522 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -195,7 +195,7 @@ lib_deps          = Servo
 platform      = atmelavr
 framework     = arduino
 board         = sanguino_atmega1284p
-build_flags   = ${common.build_flags}
+build_flags   = ${common.build_flags} -fmerge-all-constants
 upload_speed  = 57600
 lib_deps      = ${common.lib_deps}
 lib_ignore    = TMCStepper, TMC26XStepper