diff --git a/Lib/mimetypes.py b/Lib/mimetypes.py
index f1a1a3e3cb4..1f2c9d6a876 100644
--- a/Lib/mimetypes.py
+++ b/Lib/mimetypes.py
@@ -192,7 +192,7 @@ class MimeTypes:
         types.
         """
         fp = open(filename)
-        self.readfp(fp)
+        self.readfp(fp, strict)
         fp.close()
 
     def readfp(self, fp, strict=True):