diff --git a/platformio.ini b/platformio.ini
index 157b3d6201..aad59362cc 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -111,6 +111,7 @@ default_src_filter = +<src/*> -<src/config> -<src/HAL> +<src/HAL/shared>
   -<src/feature/probe_temp_comp.cpp>
   -<src/feature/repeat.cpp>
   -<src/feature/runout.cpp> -<src/gcode/feature/runout>
+  -<src/feature/snmm.cpp>
   -<src/feature/solenoid.cpp> -<src/gcode/control/M380_M381.cpp>
   -<src/feature/spindle_laser.cpp> -<src/gcode/control/M3-M5.cpp>
   -<src/feature/tmc_util.cpp> -<src/module/stepper/trinamic.cpp>
@@ -342,6 +343,7 @@ POWER_LOSS_RECOVERY     = src_filter=+<src/feature/powerloss.cpp> +<src/gcode/fe
 PROBE_TEMP_COMPENSATION = src_filter=+<src/feature/probe_temp_comp.cpp> +<src/gcode/calibrate/G76_M192_M871.cpp>
 HAS_FILAMENT_SENSOR     = src_filter=+<src/feature/runout.cpp> +<src/gcode/feature/runout>
 (EXT|MANUAL)_SOLENOID.* = src_filter=+<src/feature/solenoid.cpp> +<src/gcode/control/M380_M381.cpp>
+MK2_MULTIPLEXER         = src_filter=+<src/feature/snmm.cpp>
 HAS_CUTTER              = src_filter=+<src/feature/spindle_laser.cpp> +<src/gcode/control/M3-M5.cpp>
 EXPERIMENTAL_I2CBUS     = src_filter=+<src/feature/twibus.cpp> +<src/gcode/feature/i2c>
 MECHANICAL_GANTRY_CAL.+ = src_filter=+<src/gcode/calibrate/G34.cpp>