diff --git a/mozilla/editor/txmgr/src/nsTransactionItem.cpp b/mozilla/editor/txmgr/src/nsTransactionItem.cpp
index 546c593a88b..fd64dbd633c 100644
--- a/mozilla/editor/txmgr/src/nsTransactionItem.cpp
+++ b/mozilla/editor/txmgr/src/nsTransactionItem.cpp
@@ -233,7 +233,7 @@ nsTransactionItem::GetNumberOfRedoItems(PRInt32 *aNumItems)
 nsresult
 nsTransactionItem::Write(nsIOutputStream *aOutputStream)
 {
-  PRInt32 len;
+  PRUint32 len;
 
   if (mTransaction)
     mTransaction->Write(aOutputStream);
diff --git a/mozilla/editor/txmgr/src/nsTransactionManager.cpp b/mozilla/editor/txmgr/src/nsTransactionManager.cpp
index 614e16f4420..50deeb4cb1d 100644
--- a/mozilla/editor/txmgr/src/nsTransactionManager.cpp
+++ b/mozilla/editor/txmgr/src/nsTransactionManager.cpp
@@ -516,7 +516,7 @@ nsTransactionManager::PeekRedoStack(nsITransaction **aTransaction)
 nsresult
 nsTransactionManager::Write(nsIOutputStream *aOutputStream)
 {
-  PRInt32 len;
+  PRUint32 len;
 
   if (!aOutputStream)
     return NS_ERROR_NULL_POINTER;
diff --git a/mozilla/editor/txmgr/tests/TestTXMgr.cpp b/mozilla/editor/txmgr/tests/TestTXMgr.cpp
index 8b74a9ba073..a94d35f492a 100644
--- a/mozilla/editor/txmgr/tests/TestTXMgr.cpp
+++ b/mozilla/editor/txmgr/tests/TestTXMgr.cpp
@@ -252,7 +252,7 @@ public:
   NS_DECL_ISUPPORTS
 
   NS_IMETHOD Close(void) {return NS_OK;}
-  NS_IMETHOD Write(const char *str, PRInt32 offset, PRInt32 len, PRInt32 *wcnt)
+  NS_IMETHOD Write(const char *str, PRUint32 offset, PRUint32 len, PRUint32 *wcnt)
   {
     *wcnt = fwrite(&str[offset], 1, len, stdout);
     fflush(stdout);
@@ -448,7 +448,7 @@ public:
   virtual nsresult Write(nsIOutputStream *aOutputStream)
   {
     char buf[256];
-    PRInt32 amt;
+    PRUint32 amt;
 
     sprintf(buf, "Transaction: %d - 0x%.8x\n", mVal, this);
     return aOutputStream->Write(buf, 0, strlen(buf), &amt);