diff --git a/Lib/regsub.py b/Lib/regsub.py
index dc95028b344..a0ca8fe41e2 100644
--- a/Lib/regsub.py
+++ b/Lib/regsub.py
@@ -10,6 +10,13 @@ splitx(str, pat, maxsplit): split string using pattern as delimiter plus
                             return delimiters
 """
 
+import warnings
+warnings.warn("the regsub module is deprecated; please use re.sub()",
+	      DeprecationWarning)
+
+# Ignore further deprecation warnings about this module
+warnings.filterwarnings("ignore", "", DeprecationWarning, __name__)
+
 import regex