diff --git a/mozilla/content/html/style/src/nsCSSStyleRule.cpp b/mozilla/content/html/style/src/nsCSSStyleRule.cpp
index 309132be58d..9e77fda735d 100644
--- a/mozilla/content/html/style/src/nsCSSStyleRule.cpp
+++ b/mozilla/content/html/style/src/nsCSSStyleRule.cpp
@@ -878,8 +878,8 @@ void MapDeclarationInto(nsICSSDeclaration* aDeclaration,
 
           if ((NS_STYLE_FONT_SIZE_XXSMALL <= value) && 
               (value <= NS_STYLE_FONT_SIZE_XXLARGE)) {
-            font->mFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFont.size, scaleFactor);
-            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFixedFont.size, scaleFactor);
+            font->mFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFont.size, scaleFactor);
+            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFixedFont.size, scaleFactor);
           }
           else if (NS_STYLE_FONT_SIZE_LARGER == value) {
             PRInt32 index = nsStyleUtil::FindNextLargerFontSize(parentFont->mFont.size, (PRInt32)defaultFont.size, scaleFactor);
diff --git a/mozilla/layout/html/style/src/nsCSSStyleRule.cpp b/mozilla/layout/html/style/src/nsCSSStyleRule.cpp
index 309132be58d..9e77fda735d 100644
--- a/mozilla/layout/html/style/src/nsCSSStyleRule.cpp
+++ b/mozilla/layout/html/style/src/nsCSSStyleRule.cpp
@@ -878,8 +878,8 @@ void MapDeclarationInto(nsICSSDeclaration* aDeclaration,
 
           if ((NS_STYLE_FONT_SIZE_XXSMALL <= value) && 
               (value <= NS_STYLE_FONT_SIZE_XXLARGE)) {
-            font->mFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFont.size, scaleFactor);
-            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFixedFont.size, scaleFactor);
+            font->mFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFont.size, scaleFactor);
+            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFixedFont.size, scaleFactor);
           }
           else if (NS_STYLE_FONT_SIZE_LARGER == value) {
             PRInt32 index = nsStyleUtil::FindNextLargerFontSize(parentFont->mFont.size, (PRInt32)defaultFont.size, scaleFactor);
diff --git a/mozilla/layout/style/nsCSSStyleRule.cpp b/mozilla/layout/style/nsCSSStyleRule.cpp
index 309132be58d..9e77fda735d 100644
--- a/mozilla/layout/style/nsCSSStyleRule.cpp
+++ b/mozilla/layout/style/nsCSSStyleRule.cpp
@@ -878,8 +878,8 @@ void MapDeclarationInto(nsICSSDeclaration* aDeclaration,
 
           if ((NS_STYLE_FONT_SIZE_XXSMALL <= value) && 
               (value <= NS_STYLE_FONT_SIZE_XXLARGE)) {
-            font->mFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFont.size, scaleFactor);
-            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value + 1, (PRInt32)defaultFixedFont.size, scaleFactor);
+            font->mFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFont.size, scaleFactor);
+            font->mFixedFont.size = nsStyleUtil::CalcFontPointSize(value, (PRInt32)defaultFixedFont.size, scaleFactor);
           }
           else if (NS_STYLE_FONT_SIZE_LARGER == value) {
             PRInt32 index = nsStyleUtil::FindNextLargerFontSize(parentFont->mFont.size, (PRInt32)defaultFont.size, scaleFactor);