diff --git a/app/CMakeLists.txt b/app/CMakeLists.txt
index 71ef2b20..85f29b3c 100644
--- a/app/CMakeLists.txt
+++ b/app/CMakeLists.txt
@@ -44,7 +44,7 @@ target_sources(app PRIVATE src/behaviors/behavior_mod_tap.c)
 target_sources(app PRIVATE src/behaviors/behavior_momentary_layer.c)
 target_sources(app PRIVATE src/behaviors/behavior_transparent.c)
 target_sources(app PRIVATE src/behaviors/behavior_sensor_rotate_key_press.c)
-target_sources(app PRIVATE src/behaviors/behavior_rgb_underglow.c)
+target_sources_ifdef(CONFIG_ZMK_RGB_UNDERGLOW app PRIVATE src/behaviors/behavior_rgb_underglow.c)
 target_sources_ifdef(CONFIG_ZMK_BLE app PRIVATE src/ble.c)
 target_sources_ifdef(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL app PRIVATE src/split_listener.c)
 target_sources_ifdef(CONFIG_ZMK_SPLIT_BLE_ROLE_PERIPHERAL app PRIVATE src/split/bluetooth/service.c)