diff --git a/mozilla/layout/generic/nsObjectFrame.cpp b/mozilla/layout/generic/nsObjectFrame.cpp
index 6560d482e86..0f43260376c 100644
--- a/mozilla/layout/generic/nsObjectFrame.cpp
+++ b/mozilla/layout/generic/nsObjectFrame.cpp
@@ -952,7 +952,7 @@ nsObjectFrame::GetDesiredSize(nsPresContext* aPresContext,
   aMetrics.ascent = aMetrics.height;
 
   if (aMetrics.mComputeMEW) {
-    aMetrics.mMaxElementWidth = aMetrics.width;
+    aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
   }
 }