diff --git a/Lib/dbm/__init__.py b/Lib/dbm/__init__.py
index 76a43c4..813a29d 100644
--- a/Lib/dbm/__init__.py
+++ b/Lib/dbm/__init__.py
@@ -166,7 +166,7 @@
         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 6df5215..c786d24 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -236,6 +236,8 @@
 - Issue #10829: Refactor PyUnicode_FromFormat(), use the same function to parse
   the format string in the 3 steps, fix crashs on invalid format strings.
 
+- Issue #13007: whichdb should recognize gdbm 1.9 magic numbers.
+
 - Issue #11246: Fix PyUnicode_FromFormat("%V") to decode the byte string from
   UTF-8 (with replace error handler) instead of ISO-8859-1 (in strict mode).
   Patch written by Ray Allen.