diff --git a/mozilla/layout/generic/nsTextFrame.cpp b/mozilla/layout/generic/nsTextFrame.cpp
index dee108d6c18..24a48737bad 100644
--- a/mozilla/layout/generic/nsTextFrame.cpp
+++ b/mozilla/layout/generic/nsTextFrame.cpp
@@ -541,6 +541,8 @@ public:
       if (eStyleUnit_Coord == unit) {
         mLetterSpacing = mText->mLetterSpacing.GetCoordValue();
       }
+      mWordSpacing += mLetterSpacing; // bug 1046
+
       mNumSpacesToRender = 0;
       mNumSpacesToMeasure = 0;
       mNumSpacesReceivingExtraJot = 0;
diff --git a/mozilla/layout/html/base/src/nsTextFrame.cpp b/mozilla/layout/html/base/src/nsTextFrame.cpp
index dee108d6c18..24a48737bad 100644
--- a/mozilla/layout/html/base/src/nsTextFrame.cpp
+++ b/mozilla/layout/html/base/src/nsTextFrame.cpp
@@ -541,6 +541,8 @@ public:
       if (eStyleUnit_Coord == unit) {
         mLetterSpacing = mText->mLetterSpacing.GetCoordValue();
       }
+      mWordSpacing += mLetterSpacing; // bug 1046
+
       mNumSpacesToRender = 0;
       mNumSpacesToMeasure = 0;
       mNumSpacesReceivingExtraJot = 0;