diff --git a/content/base/src/nsDocumentEncoder.cpp b/content/base/src/nsDocumentEncoder.cpp
index bd6acb98907..1fd2c346573 100644
--- a/content/base/src/nsDocumentEncoder.cpp
+++ b/content/base/src/nsDocumentEncoder.cpp
@@ -123,7 +123,7 @@ nsHTMLEncoder::PrettyPrint(PRBool aYes)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-NS_IMETHODIMP
+nsresult
 NS_NewHTMLEncoder(nsIDocumentEncoder** aResult)
 {
   *aResult = new nsHTMLEncoder;
diff --git a/layout/base/src/nsDocumentEncoder.cpp b/layout/base/src/nsDocumentEncoder.cpp
index bd6acb98907..1fd2c346573 100644
--- a/layout/base/src/nsDocumentEncoder.cpp
+++ b/layout/base/src/nsDocumentEncoder.cpp
@@ -123,7 +123,7 @@ nsHTMLEncoder::PrettyPrint(PRBool aYes)
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 
-NS_IMETHODIMP
+nsresult
 NS_NewHTMLEncoder(nsIDocumentEncoder** aResult)
 {
   *aResult = new nsHTMLEncoder;