diff --git a/libctf/ChangeLog b/libctf/ChangeLog
index 3eff44c146a..c27464110fc 100644
--- a/libctf/ChangeLog
+++ b/libctf/ChangeLog
@@ -1,3 +1,8 @@
+2021-03-18  Nick Alcock  <nick.alcock@oracle.com>
+
+	* ctf-serialize.c (ctf_serialize): Preserve ctf_typemax across
+	serialization.
+
 2021-03-18  Nick Alcock  <nick.alcock@oracle.com>
 
 	* ctf-impl.h (ctf_dtdef_t) <dtd_u.dtu_argv>: Remove.
diff --git a/libctf/ctf-serialize.c b/libctf/ctf-serialize.c
index 460ae1a510e..17f11f67ffb 100644
--- a/libctf/ctf-serialize.c
+++ b/libctf/ctf-serialize.c
@@ -1113,6 +1113,7 @@ ctf_serialize (ctf_dict_t *fp)
   nfp->ctf_dynsyms = fp->ctf_dynsyms;
   nfp->ctf_ptrtab = fp->ctf_ptrtab;
   nfp->ctf_pptrtab = fp->ctf_pptrtab;
+  nfp->ctf_typemax = fp->ctf_typemax;
   nfp->ctf_dynsymidx = fp->ctf_dynsymidx;
   nfp->ctf_dynsymmax = fp->ctf_dynsymmax;
   nfp->ctf_ptrtab_len = fp->ctf_ptrtab_len;