diff --git a/intl/uconv/src/nsMacCharset.cpp b/intl/uconv/src/nsMacCharset.cpp
index c20630da6f5b..84d4ba7f6091 100644
--- a/intl/uconv/src/nsMacCharset.cpp
+++ b/intl/uconv/src/nsMacCharset.cpp
@@ -74,14 +74,14 @@ nsMacCharset::nsMacCharset()
 	  long ret = ::GetScriptManagerVariable(smRegionCode);
 	  PRInt32 reg = (PRInt32)(ret & 0x00FFFF);
  	  nsAutoString regionKey; regionKey.AssignWithConversion("region.");
-	  regionKey.AppendWithConversion(reg, 10);
+	  regionKey.AppendInt(reg, 10);
 	  
 	  nsresult res = gInfo->Get(regionKey, mCharset);
 	  if(NS_FAILED(res)) {
 		  ret = ::GetScriptManagerVariable(smSysScript);
 		  PRInt32 script = (PRInt32)(ret & 0x00FFFF);
 		  nsAutoString scriptKey; scriptKey.AssignWithConversion("script.");
-		  scriptKey.AppendWithConversion(script, 10);
+		  scriptKey.AppendInt(script, 10);
 	 	  nsresult res = gInfo->Get(scriptKey, mCharset);
 	      if(NS_FAILED(res)) {
 	      	  mCharset.AssignWithConversion("x-mac-roman");
@@ -126,12 +126,12 @@ nsMacCharset::GetDefaultCharsetForLocale(const PRUnichar* localeName, PRUnichar*
 	if (!gInfo) { *_retValue = charset.ToNewUnicode(); return NS_ERROR_OUT_OF_MEMORY; }
 	
 	nsAutoString locale_key; locale_key.AssignWithConversion("region.");
-	locale_key.AppendWithConversion(region,10);
+	locale_key.AppendInt(region,10);
 	
 	rv = gInfo->Get(locale_key,charset);
 	if (NS_FAILED(rv)) {
 		locale_key.AssignWithConversion("script.");
-		locale_key.AppendWithConversion(script,10);
+		locale_key.AppendInt(script,10);
 		rv = gInfo->Get(locale_key,charset);
 		if (NS_FAILED(rv)) { charset.AssignWithConversion("x-mac-roman");}
 	}
diff --git a/rdf/tests/domds/nsRDFDOMDataSource.cpp b/rdf/tests/domds/nsRDFDOMDataSource.cpp
index 0e8191a09ed4..9cc8fece7cbc 100644
--- a/rdf/tests/domds/nsRDFDOMDataSource.cpp
+++ b/rdf/tests/domds/nsRDFDOMDataSource.cpp
@@ -222,7 +222,7 @@ nsRDFDOMDataSource::createDOMNodeTarget(nsIDOMNode *node,
   else if (aProperty == kNC_Type) {
     PRUint16 type;
     node->GetNodeType(&type);
-    str.Append(PRInt32(type));
+    str.AppendInt(PRInt32(type));
   }
   return createLiteral(str, aResult);
 }
@@ -382,7 +382,7 @@ nsRDFDOMDataSource::createContentMiscArcs(nsIContent *content,
 
   PRInt32 namespaceID;
   content->GetNameSpaceID(namespaceID);
-  value.Append(namespaceID);
+  value.AppendInt(namespaceID);
 
   appendLeafObject(name, value, arcs);