Index: django/template/loader_tags.py
===================================================================
--- django/template/loader_tags.py	(revision 7547)
+++ django/template/loader_tags.py	(working copy)
@@ -181,4 +181,4 @@
     path = bits[1]
-    if path[0] in ('"', "'") and path[-1] == path[0]:
+    if path[0] in ('"', "'") and path[-1] == path[0] and not path[0] in path[1:-1]:
         return ConstantIncludeNode(path[1:-1])