diff --git a/src/meson.build b/src/meson.build
index 6fb66a1..12f8ee5 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -121,6 +121,7 @@
     executable(
         'fansensor',
         'FanMain.cpp',
+        'PresenceGpio.cpp',
         'TachSensor.cpp',
         'PwmSensor.cpp',
         dependencies: [