--- a/layout/generic/nsFloatManager.cpp
+++ b/layout/generic/nsFloatManager.cpp
@@ -116,27 +116,27 @@ void nsFloatManager::Shutdown()
   sCachedFloatManagerCount = -1;
 }
 
 #define CHECK_BLOCK_DIR(aWM) \
   NS_ASSERTION((aWM).GetBlockDir() == mWritingMode.GetBlockDir(), \
   "incompatible writing modes")
 
 nsFlowAreaRect
-nsFloatManager::GetFlowArea(WritingMode aWM, nscoord aBOffset,
+nsFloatManager::GetFlowArea(WritingMode aWM, nscoord aBCoord,
                             BandInfoType aInfoType, nscoord aBSize,
                             LogicalRect aContentArea, SavedState* aState,
                             const nsSize& aContainerSize) const
 {
   CHECK_BLOCK_DIR(aWM);
   NS_ASSERTION(aBSize >= 0, "unexpected max block size");
   NS_ASSERTION(aContentArea.ISize(aWM) >= 0,
                "unexpected content area inline size");
 
-  nscoord blockStart = aBOffset + mBlockStart;
+  nscoord blockStart = aBCoord + mBlockStart;
   if (blockStart < nscoord_MIN) {
     NS_WARNING("bad value");
     blockStart = nscoord_MIN;
   }
 
   // Determine the last float that we should consider.
   uint32_t floatCount;
   if (aState) {
@@ -148,17 +148,17 @@ nsFloatManager::GetFlowArea(WritingMode 
     floatCount = mFloats.Length();
   }
 
   // If there are no floats at all, or we're below the last one, return
   // quickly.
   if (floatCount == 0 ||
       (mFloats[floatCount-1].mLeftBEnd <= blockStart &&
        mFloats[floatCount-1].mRightBEnd <= blockStart)) {
-    return nsFlowAreaRect(aWM, aContentArea.IStart(aWM), aBOffset,
+    return nsFlowAreaRect(aWM, aContentArea.IStart(aWM), aBCoord,
                           aContentArea.ISize(aWM), aBSize, false);
   }
 
   nscoord blockEnd;
   if (aBSize == nscoord_MAX) {
     // This warning (and the two below) are possible to hit on pages
     // with really large objects.
     NS_WARNING_ASSERTION(aInfoType == BAND_FROM_POINT, "bad height");