diff --git a/editor/base/nsEditorShell.cpp b/editor/base/nsEditorShell.cpp
index 74550558e86c..870ecc796f40 100644
--- a/editor/base/nsEditorShell.cpp
+++ b/editor/base/nsEditorShell.cpp
@@ -351,7 +351,7 @@ nsEditorShell::InstantiateEditor(nsIDOMDocument *aDoc, nsIPresShell *aPresShell)
     {
       err = editor->Init(aDoc, aPresShell, 0);
     }
-    else if (mEditorTypeString == "htmlMail")  //  HTML editor with special mail rules
+    else if (mEditorTypeString == "htmlmail")  //  HTML editor with special mail rules
     {
       err = editor->Init(aDoc, aPresShell, nsIHTMLEditor::eEditorMailMask);
     }
diff --git a/editor/composer/src/nsEditorShell.cpp b/editor/composer/src/nsEditorShell.cpp
index 74550558e86c..870ecc796f40 100644
--- a/editor/composer/src/nsEditorShell.cpp
+++ b/editor/composer/src/nsEditorShell.cpp
@@ -351,7 +351,7 @@ nsEditorShell::InstantiateEditor(nsIDOMDocument *aDoc, nsIPresShell *aPresShell)
     {
       err = editor->Init(aDoc, aPresShell, 0);
     }
-    else if (mEditorTypeString == "htmlMail")  //  HTML editor with special mail rules
+    else if (mEditorTypeString == "htmlmail")  //  HTML editor with special mail rules
     {
       err = editor->Init(aDoc, aPresShell, nsIHTMLEditor::eEditorMailMask);
     }