--- a/gfx/layers/apz/src/AutoscrollAnimation.cpp
+++ b/gfx/layers/apz/src/AutoscrollAnimation.cpp
@@ -52,17 +52,17 @@ AutoscrollAnimation::DoSample(FrameMetri
   ScreenPoint mouseLocation = treeManager->GetCurrentMousePosition();
 
   // The implementation of this function closely mirrors that of its main-
   // thread equivalent, the autoscrollLoop() function in
   // toolkit/content/browser-content.js.
 
   // Avoid long jumps when the browser hangs for more than |maxTimeDelta| ms.
   static const TimeDuration maxTimeDelta = TimeDuration::FromMilliseconds(100);
-  TimeDuration timeDelta = TimeDuration::Max(aDelta, maxTimeDelta);
+  TimeDuration timeDelta = TimeDuration::Min(aDelta, maxTimeDelta);
 
   float timeCompensation = timeDelta.ToMilliseconds() / 20;
 
   // Notes:
   //   - The main-thread implementation rounds the scroll delta to an integer,
   //     and keeps track of the fractional part as an "error". It does this
   //     because it uses Window.scrollBy() or Element.scrollBy() to perform
   //     the scrolling, and those functions truncate the fractional part of