diff --git a/mozilla/string/obsolete/nsStr.cpp b/mozilla/string/obsolete/nsStr.cpp
index 4125e5f8a62..76739b99d1f 100644
--- a/mozilla/string/obsolete/nsStr.cpp
+++ b/mozilla/string/obsolete/nsStr.cpp
@@ -132,7 +132,7 @@ PRBool nsStr::GrowCapacity(nsStr& aDest,PRUint32 aNewLength) {
   PRBool result=PR_TRUE;
   if(aNewLength>aDest.mCapacity) {
     nsStr theTempStr;
-    nsStr::Initialize(theTempStr,aDest.mCharSize);
+    nsStr::Initialize(theTempStr,eCharSize(aDest.mCharSize));
 
 #ifndef NS_USE_OLD_STRING_ALLOCATION_STRATEGY
       // the new strategy is, allocate exact size, double on grows
@@ -232,7 +232,7 @@ void nsStr::StrInsert( nsStr& aDest,PRUint32 aDestOffset,const nsStr& aSource,PR
 
           if(aDest.mLength+theLength > aDest.mCapacity) {
             nsStr theTempStr;
-            nsStr::Initialize(theTempStr,aDest.mCharSize);
+            nsStr::Initialize(theTempStr,eCharSize(aDest.mCharSize));
 
             PRBool isBigEnough=EnsureCapacity(theTempStr,aDest.mLength+theLength);  //grow the temp buffer to the right size
 
diff --git a/mozilla/string/obsolete/nsStr.h b/mozilla/string/obsolete/nsStr.h
index 781d32ad78d..3fb76fae389 100644
--- a/mozilla/string/obsolete/nsStr.h
+++ b/mozilla/string/obsolete/nsStr.h
@@ -455,14 +455,15 @@ struct NS_COM nsStr {
 
   PRUint32        mLength;
   PRUint32        mCapacity;
-  eCharSize       mCharSize;
-  PRBool          mOwnsBuffer;
-
+  
   union { 
     char*         mStr;
     PRUnichar*    mUStr;
   };
 
+  PRInt8          mCharSize;
+  PRPackedBool    mOwnsBuffer;
+
 private:
   static PRBool Alloc(nsStr& aString,PRUint32 aCount);
   static PRBool Realloc(nsStr& aString,PRUint32 aCount);
diff --git a/mozilla/string/obsolete/nsString.cpp b/mozilla/string/obsolete/nsString.cpp
index cdb6f1a4d5d..fd18cc2c26a 100644
--- a/mozilla/string/obsolete/nsString.cpp
+++ b/mozilla/string/obsolete/nsString.cpp
@@ -114,7 +114,7 @@ nsCString::nsCString(const nsStr &aString)  {
  * @param   reference to another nsCString
  */
 nsCString::nsCString(const nsCString& aString)  {
-  Initialize(*this,aString.mCharSize);
+  Initialize(*this,eCharSize(aString.mCharSize));
   StrAssign(*this,aString,0,aString.mLength);
 }
 
diff --git a/mozilla/xpcom/string/obsolete/nsStr.cpp b/mozilla/xpcom/string/obsolete/nsStr.cpp
index 4125e5f8a62..76739b99d1f 100644
--- a/mozilla/xpcom/string/obsolete/nsStr.cpp
+++ b/mozilla/xpcom/string/obsolete/nsStr.cpp
@@ -132,7 +132,7 @@ PRBool nsStr::GrowCapacity(nsStr& aDest,PRUint32 aNewLength) {
   PRBool result=PR_TRUE;
   if(aNewLength>aDest.mCapacity) {
     nsStr theTempStr;
-    nsStr::Initialize(theTempStr,aDest.mCharSize);
+    nsStr::Initialize(theTempStr,eCharSize(aDest.mCharSize));
 
 #ifndef NS_USE_OLD_STRING_ALLOCATION_STRATEGY
       // the new strategy is, allocate exact size, double on grows
@@ -232,7 +232,7 @@ void nsStr::StrInsert( nsStr& aDest,PRUint32 aDestOffset,const nsStr& aSource,PR
 
           if(aDest.mLength+theLength > aDest.mCapacity) {
             nsStr theTempStr;
-            nsStr::Initialize(theTempStr,aDest.mCharSize);
+            nsStr::Initialize(theTempStr,eCharSize(aDest.mCharSize));
 
             PRBool isBigEnough=EnsureCapacity(theTempStr,aDest.mLength+theLength);  //grow the temp buffer to the right size
 
diff --git a/mozilla/xpcom/string/obsolete/nsStr.h b/mozilla/xpcom/string/obsolete/nsStr.h
index 781d32ad78d..3fb76fae389 100644
--- a/mozilla/xpcom/string/obsolete/nsStr.h
+++ b/mozilla/xpcom/string/obsolete/nsStr.h
@@ -455,14 +455,15 @@ struct NS_COM nsStr {
 
   PRUint32        mLength;
   PRUint32        mCapacity;
-  eCharSize       mCharSize;
-  PRBool          mOwnsBuffer;
-
+  
   union { 
     char*         mStr;
     PRUnichar*    mUStr;
   };
 
+  PRInt8          mCharSize;
+  PRPackedBool    mOwnsBuffer;
+
 private:
   static PRBool Alloc(nsStr& aString,PRUint32 aCount);
   static PRBool Realloc(nsStr& aString,PRUint32 aCount);
diff --git a/mozilla/xpcom/string/obsolete/nsString.cpp b/mozilla/xpcom/string/obsolete/nsString.cpp
index cdb6f1a4d5d..fd18cc2c26a 100644
--- a/mozilla/xpcom/string/obsolete/nsString.cpp
+++ b/mozilla/xpcom/string/obsolete/nsString.cpp
@@ -114,7 +114,7 @@ nsCString::nsCString(const nsStr &aString)  {
  * @param   reference to another nsCString
  */
 nsCString::nsCString(const nsCString& aString)  {
-  Initialize(*this,aString.mCharSize);
+  Initialize(*this,eCharSize(aString.mCharSize));
   StrAssign(*this,aString,0,aString.mLength);
 }