diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 0cc0c57..1da6967 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -729,6 +729,7 @@
     linecache.clearcache()
     mimetypes._default_mime_types()
     filecmp._cache.clear()
+    struct._clearcache()
     doctest.master = None
 
     # Collect cyclic trash.