--- a/gfx/layers/apz/src/AsyncPanZoomController.cpp
+++ b/gfx/layers/apz/src/AsyncPanZoomController.cpp
@@ -674,17 +674,17 @@ AsyncPanZoomController::InitializeGlobal
 
   gZoomAnimationFunction = new ComputedTimingFunction();
   gZoomAnimationFunction->Init(
     nsTimingFunction(NS_STYLE_TRANSITION_TIMING_FUNCTION_EASE));
   ClearOnShutdown(&gZoomAnimationFunction);
   gVelocityCurveFunction = new ComputedTimingFunction();
   gVelocityCurveFunction->Init(
     nsTimingFunction(gfxPrefs::APZCurveFunctionX1(),
-                     gfxPrefs::APZCurveFunctionY2(),
+                     gfxPrefs::APZCurveFunctionY1(),
                      gfxPrefs::APZCurveFunctionX2(),
                      gfxPrefs::APZCurveFunctionY2()));
   ClearOnShutdown(&gVelocityCurveFunction);
 
   uint64_t sysmem = PR_GetPhysicalMemorySize();
   uint64_t threshold = 1LL << 32; // 4 GB in bytes
   gIsHighMemSystem = sysmem >= threshold;
 }