diff --git a/genshi/compat.py b/genshi/compat.py
index 2f8c481..2abca13 100644
--- a/genshi/compat.py
+++ b/genshi/compat.py
@@ -20,6 +20,7 @@
 except ImportError:
     import _ast as ast
 import sys
+import warnings
 from types import CodeType
 
 import six
@@ -137,13 +138,15 @@ def build_code_chunk(code, filename, name, lineno):
 
 # In Python 3.8, Str and Ellipsis was replaced by Constant
 
-try:
-    _ast_Ellipsis = ast.Ellipsis
-    _ast_Str = ast.Str
-    _ast_Str_value = lambda obj: obj.s
-except AttributeError:
-    _ast_Ellipsis = _ast_Str = ast.Constant
-    _ast_Str_value = lambda obj: obj.value
+with warnings.catch_warnings():
+    warnings.filterwarnings('error', category=DeprecationWarning)
+    try:
+        _ast_Ellipsis = ast.Ellipsis
+        _ast_Str = ast.Str
+        _ast_Str_value = lambda obj: obj.s
+    except (AttributeError, DeprecationWarning):
+        _ast_Ellipsis = _ast_Str = ast.Constant
+        _ast_Str_value = lambda obj: obj.value
 
 class _DummyASTItem(object):
     pass