diff --git a/Lib/dbm/__init__.py b/Lib/dbm/__init__.py
index 76a43c43f38b..813a29d70922 100644
--- a/Lib/dbm/__init__.py
+++ b/Lib/dbm/__init__.py
@@ -166,7 +166,7 @@ def whichdb(filename):
         return ""
 
     # Check for GNU dbm
-    if magic == 0x13579ace:
+    if magic in (0x13579ace, 0x13579acd, 0x13579acf):
         return "dbm.gnu"
 
     # Later versions of Berkeley db hash file have a 12-byte pad in
diff --git a/Misc/NEWS b/Misc/NEWS
index 5289c3799dd2..bfe536925aa2 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -55,6 +55,8 @@ Library
 - Issue #11657: Fix sending file descriptors over 255 over a multiprocessing
   Pipe.
 
+- Issue #13007: whichdb should recognize gdbm 1.9 magic numbers.
+
 - Issue #12213: Fix a buffering bug with interleaved reads and writes that
   could appear on BufferedRandom streams.