--- a/layout/mathml/nsMathMLChar.cpp
+++ b/layout/mathml/nsMathMLChar.cpp
@@ -958,18 +958,16 @@ private:
 // Always updates the char if a better match is found.
 bool
 nsMathMLChar::StretchEnumContext::TryVariants(nsGlyphTable*    aGlyphTable,
                                               const nsAString& aFamily)
 {
   // Use our stretchy style context now that stretching is in progress
   nsStyleContext *sc = mChar->mStyleContext;
   nsFont font = sc->StyleFont()->mFont;
-  // Ensure SetFontFamily will set the font
-  font.name.Truncate();
 
   bool isVertical = (mDirection == NS_STRETCH_DIRECTION_VERTICAL);
   bool largeop = (NS_STRETCH_LARGEOP & mStretchHint) != 0;
   bool largeopOnly =
     largeop && (NS_STRETCH_VARIABLE_MASK & mStretchHint) == 0;
   bool maxWidth = (NS_STRETCH_MAXWIDTH & mStretchHint) != 0;
 
   nscoord bestSize =
@@ -1059,18 +1057,16 @@ nsMathMLChar::StretchEnumContext::TryPar
 {
   if (!aGlyphTable->HasPartsOf(mChar->mData[0]))
     return false; // to next table
 
   // See if the parts of this table fit in the desired space //////////////////
 
   // Use our stretchy style context now that stretching is in progress
   nsFont font = mChar->mStyleContext->StyleFont()->mFont;
-  // Ensure SetFontFamily will set the font
-  font.name.Truncate();
 
   // Compute the bounding metrics of all partial glyphs
   nsAutoPtr<gfxTextRun> textRun[4];
   nsGlyphCode chdata[4];
   nsBoundingMetrics bmdata[4];
   nscoord sizedata[4];
 
   bool isVertical = (mDirection == NS_STRETCH_DIRECTION_VERTICAL);