diff --git a/securesystemslib/schema.py b/securesystemslib/schema.py
index a898d75a..0fe63f60 100755
--- a/securesystemslib/schema.py
+++ b/securesystemslib/schema.py
@@ -236,7 +236,7 @@ class AnyNonemptyString(AnyString):
   """
 
   def check_match(self, object):
-    super().check_match(object)
+    AnyString.check_match(self, object)
 
     if object == "":
         raise securesystemslib.exceptions.FormatError('Expected a string'