diff --git a/src/__init__.py b/src/__init__.py
index 7ccd6bebf..a7ff0abc1 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -3560,16 +3560,12 @@ def close(self):
         #self._reset_page_refs()
         #self.metadata    = None
         #self.stream      = None
-        #self.is_closed    = True
+        self.is_closed    = True
         #self.FontInfos   = []
         #self.Graftmaps = {}
         #self.ShownPages = {}
         #self.InsertedImages  = {}
-        
         #self.this = None
-        self.close_internal()
-
-    def close_internal(self):
         self.this = None
 
     def convert_to_pdf(self, from_page=0, to_page=-1, rotate=0):
diff --git a/tests/test_general.py b/tests/test_general.py
index bfb6ae185..9eb7c51c6 100644
--- a/tests/test_general.py
+++ b/tests/test_general.py
@@ -153,6 +153,7 @@ def test_bug1971():
         page = next(doc.pages())
         page.get_drawings()
         doc.close()
+        assert doc.is_closed
 
 def test_default_font():
     f = fitz.Font()