--- a/layout/generic/nsBlockFrame.cpp
+++ b/layout/generic/nsBlockFrame.cpp
@@ -1500,17 +1500,17 @@ nsBlockFrame::ComputeFinalSize(const nsH
                                nscoord*                 aBEndEdgeOfChildren)
 {
   WritingMode wm = aState.mReflowState.GetWritingMode();
   const LogicalMargin& borderPadding = aState.BorderPadding();
 #ifdef NOISY_FINAL_SIZE
   ListTag(stdout);
   printf(": mBCoord=%d mIsBEndMarginRoot=%s mPrevBEndMargin=%d bp=%d,%d\n",
          aState.mBCoord, aState.GetFlag(BRS_ISBENDMARGINROOT) ? "yes" : "no",
-         aState.mPrevBEndMargin,
+         aState.mPrevBEndMargin.get(),
          borderPadding.BStart(wm), borderPadding.BEnd(wm));
 #endif
 
   // Compute final inline size
   LogicalSize finalSize(wm);
   finalSize.ISize(wm) =
     NSCoordSaturatingAdd(NSCoordSaturatingAdd(borderPadding.IStart(wm),
                                               aReflowState.ComputedISize()),