diff --git a/layout/generic/nsFontInflationData.cpp b/layout/generic/nsFontInflationData.cpp
index 27aec4dcc97..0a629e2a19f 100644
--- a/layout/generic/nsFontInflationData.cpp
+++ b/layout/generic/nsFontInflationData.cpp
@@ -235,6 +235,7 @@ nsFontInflationData::UpdateWidth(const nsHTMLReflowState &aReflowState)
     mTextDirty = true;
   }
 
+  mNCAWidth = newNCAWidth;
   mTextThreshold = newTextThreshold;
   mInflationEnabled = mTextAmount >= mTextThreshold;
 }
diff --git a/layout/generic/nsFontInflationData.h b/layout/generic/nsFontInflationData.h
index ede8aadd487..bf0a30f5569 100644
--- a/layout/generic/nsFontInflationData.h
+++ b/layout/generic/nsFontInflationData.h
@@ -64,6 +64,10 @@ public:
     return mInflationEnabled;
   }
 
+  nscoord EffectiveWidth() const {
+    return mNCAWidth;
+  }
+
 private:
 
   nsFontInflationData(nsIFrame* aBFCFrame);
@@ -94,6 +98,7 @@ private:
   }
 
   nsIFrame *mBFCFrame;
+  nscoord mNCAWidth;
   nscoord mTextAmount, mTextThreshold;
   bool mInflationEnabled; // for this BFC
   bool mTextDirty;