diff --git a/core/java/android/view/InsetsAnimationControlImpl.java b/core/java/android/view/InsetsAnimationControlImpl.java
index 35098cbd3103e..f3e9472d38848 100644
--- a/core/java/android/view/InsetsAnimationControlImpl.java
+++ b/core/java/android/view/InsetsAnimationControlImpl.java
@@ -275,7 +275,7 @@ public class InsetsAnimationControlImpl implements WindowInsetsAnimationControll
             // If the system is controlling the insets source, the leash can be null.
             if (leash != null) {
                 // TODO: use a better interpolation for fade.
-                alpha = mFade ? ((float) maxInset / inset * 0.3f + 0.7f) : alpha;
+                alpha = mFade ? ((float) inset / maxInset * 0.3f + 0.7f) : alpha;
                 surfaceParams.add(new SurfaceParams(leash, side == ISIDE_FLOATING ? 1 : alpha,
                         mTmpMatrix, null /* windowCrop */, 0 /* layer */, 0f /* cornerRadius*/,
                         side == ISIDE_FLOATING ? state.getSource(source.getType()).isVisible()