diff --git a/doc/lispref/type_hierarchy.txt b/doc/lispref/type_hierarchy.txt
index c6e762b04a8..2ffee0b6a85 100644
--- a/doc/lispref/type_hierarchy.txt
+++ b/doc/lispref/type_hierarchy.txt
@@ -5,7 +5,7 @@
                            |
                            v
      +-------------+     +--------------------+     +----------------------+     +--------+
-     |    fixum    | --> |      integer       | --> |  integer-or-marker   | <-- | marker |
+     |   fixnum    | --> |      integer       | --> |  integer-or-marker   | <-- | marker |
      +-------------+     +--------------------+     +----------------------+     +--------+
                            |                          |                            |
                            |                          |                            |
diff --git a/lisp/emacs-lisp/cl-preloaded.el b/lisp/emacs-lisp/cl-preloaded.el
index 323d826f323..0b30e10b344 100644
--- a/lisp/emacs-lisp/cl-preloaded.el
+++ b/lisp/emacs-lisp/cl-preloaded.el
@@ -65,7 +65,7 @@ cl--type-hierarchy
      number-or-marker symbol array)
     (number float integer)
     (number-or-marker marker number)
-    (integer bignum fixum)
+    (integer bignum fixnum)
     (symbol keyword boolean symbol-with-pos)
     (array vector bool-vector char-table string)
     (list null cons)