diff --git a/variants/thinknode_m5/platformio.ini b/variants/thinknode_m5/platformio.ini
index 23db506a..fb2ba3ac 100644
--- a/variants/thinknode_m5/platformio.ini
+++ b/variants/thinknode_m5/platformio.ini
@@ -3,7 +3,7 @@ extends = esp32_base
 board = ESP32-S3-WROOM-1-N4
 build_flags = ${esp32_base.build_flags}
   -I variants/thinknode_m5
-  -I src/helpres/sensors
+  -I src/helpers/sensors
   -D THINKNODE_M5
   -D PIN_BUZZER=9
   -D PIN_BOARD_SCL=1
@@ -44,7 +44,6 @@ build_src_filter = ${esp32_base.build_src_filter}
   +<helpers/sensors/EnvironmentSensorManager.cpp>
   +<helpers/ui/MomentaryButton.cpp>
   +<helpers/ui/GxEPDDisplay.cpp>
-  +<helpers/ui/buzzer.cpp>
   +<../variants/thinknode_m5>
 lib_deps = ${esp32_base.lib_deps}
   zinggjm/GxEPD2 @ 1.6.2
@@ -159,6 +158,7 @@ build_src_filter = ${ThinkNode_M5.build_src_filter}
   +<helpers/ui/MomentaryButton.cpp>
   +<../examples/companion_radio/*.cpp>
   +<../examples/companion_radio/ui-new/*.cpp>
+  +<helpers/ui/buzzer.cpp>
 lib_deps =
   ${ThinkNode_M5.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -177,6 +177,7 @@ build_src_filter = ${ThinkNode_M5.build_src_filter}
   +<helpers/ui/MomentaryButton.cpp>
   +<../examples/companion_radio/*.cpp>
   +<../examples/companion_radio/ui-new/*.cpp>
+  +<helpers/ui/buzzer.cpp>
 lib_deps =
   ${ThinkNode_M5.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -198,6 +199,7 @@ build_src_filter = ${ThinkNode_M5.build_src_filter}
   +<helpers/ui/MomentaryButton.cpp>
   +<../examples/companion_radio/*.cpp>
   +<../examples/companion_radio/ui-new/*.cpp>
+  +<helpers/ui/buzzer.cpp>
 lib_deps =
   ${ThinkNode_M5.lib_deps}
   densaugeo/base64 @ ~1.4.0
@@ -219,6 +221,8 @@ build_src_filter = ${ThinkNode_M5.build_src_filter}
   +<helpers/ui/MomentaryButton.cpp>
   +<../examples/companion_radio/*.cpp>
   +<../examples/companion_radio/ui-new/*.cpp>
+  +<helpers/ui/buzzer.cpp>
 lib_deps =
   ${ThinkNode_M5.lib_deps}
   densaugeo/base64 @ ~1.4.0
+  end2endzone/NonBlockingRTTTL@^1.3.0