diff --git a/mozilla/editor/libeditor/html/nsHTMLEditRules.cpp b/mozilla/editor/libeditor/html/nsHTMLEditRules.cpp
index 251ca22b1d5..22f1282b09b 100644
--- a/mozilla/editor/libeditor/html/nsHTMLEditRules.cpp
+++ b/mozilla/editor/libeditor/html/nsHTMLEditRules.cpp
@@ -4125,7 +4125,19 @@ nsHTMLEditRules::WillOutdent(nsISelection *aSelection, PRBool *aCancel, PRBool *
           if (NS_FAILED(res)) return res;
         }
         else if (useCSS) {
-          RelativeChangeIndentationOfElementNode(curNode, -1);
+          nsCOMPtr<nsIDOMElement> element;
+          nsCOMPtr<nsIDOMText> textNode = do_QueryInterface(curNode);
+          if (textNode) {
+            // We want to outdent the parent of text nodes
+            nsCOMPtr<nsIDOMNode> parent;
+            textNode->GetParentNode(getter_AddRefs(parent));
+            element = do_QueryInterface(parent);
+          } else {
+            element = do_QueryInterface(curNode);
+          }
+          if (element) {
+            RelativeChangeIndentationOfElementNode(element, -1);
+          }
         }
       }
     }