diff --git a/media/libheadtracking/Android.bp b/media/libheadtracking/Android.bp
index 63b769e..b0563e2 100644
--- a/media/libheadtracking/Android.bp
+++ b/media/libheadtracking/Android.bp
@@ -18,6 +18,7 @@
       "PoseRateLimiter.cpp",
       "QuaternionUtil.cpp",
       "ScreenHeadFusion.cpp",
+      "StillnessDetector.cpp",
       "Twist.cpp",
     ],
     export_include_dirs: [
@@ -70,6 +71,7 @@
         "PoseRateLimiter-test.cpp",
         "QuaternionUtil-test.cpp",
         "ScreenHeadFusion-test.cpp",
+        "StillnessDetector-test.cpp",
         "Twist-test.cpp",
     ],
     shared_libs: [