diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index f077f87..9071430 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -91,7 +91,7 @@
         return ""
 
     # Check for GNU dbm
-    if magic == 0x13579ace:
+    if magic in (0x13579ace, 0x13579acd, 0x13579acf):
         return "gdbm"
 
     # Check for old Berkeley db hash file format v2
diff --git a/Misc/NEWS b/Misc/NEWS
index 7984e17..2b67883 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -76,6 +76,8 @@
 - Issue #12326: sys.platform is now always 'linux2' on Linux, even if Python
   is compiled on Linux 3.
 
+- Issue #13007: whichdb should recognize gdbm 1.9 magic numbers.
+
 - Issue #9173: Let shutil._make_archive work if the logger argument is None.
 
 - Issue #12650: Fix a race condition where a subprocess.Popen could leak