diff --git a/mozilla/layout/generic/nsBlockFrame.cpp b/mozilla/layout/generic/nsBlockFrame.cpp
index bd58cc591a4..d0a4171d489 100644
--- a/mozilla/layout/generic/nsBlockFrame.cpp
+++ b/mozilla/layout/generic/nsBlockFrame.cpp
@@ -4038,7 +4038,6 @@ nsBlockFrame::PlaceLine(nsBlockReflowState& aState,
     nscoord dy = aState.GetFlag(BRS_APPLYTOPMARGIN)
                    ? -aState.mPrevBottomMargin.get() : 0;
     newY = aState.mY + dy;
-    aLine->SlideBy(dy); // XXXldb Do we really want to do this?
   }
 
   // See if the line fit. If it doesn't we need to push it. Our first