diff --git a/layout/generic/nsObjectFrame.cpp b/layout/generic/nsObjectFrame.cpp
index 74ab8cf39d70..6f81db1455a0 100644
--- a/layout/generic/nsObjectFrame.cpp
+++ b/layout/generic/nsObjectFrame.cpp
@@ -660,7 +660,7 @@ nsObjectFrame::GetDesiredSize(nsPresContext* aPresContext,
   aMetrics.ascent = aMetrics.height;
 
   if (aMetrics.mComputeMEW) {
-    aMetrics.mMaxElementWidth = aMetrics.width;
+    aMetrics.SetMEWToActualWidth(aReflowState.mStylePosition->mWidth.GetUnit());
   }
 }