diff --git a/contrib/groff/tmac/doc-syms b/contrib/groff/tmac/doc-syms
index 27afb847b826..da9ce3617c50 100644
--- a/contrib/groff/tmac/doc-syms
+++ b/contrib/groff/tmac/doc-syms
@@ -814,7 +814,6 @@
 .ds doc-str-Lb-librt       \*[Px] \*[doc-str-Lb]Real-time Library (librt, \-lrt)
 .ds doc-str-Lb-libsdp      Bluetooth Service Discovery Protocol User Library (libsdp, \-lsdp)
 .ds doc-str-Lb-libssp      Buffer Overflow Protection Library (libssp, \-lssp)
-.ds doc-str-Lb-libstdthreads C11 Threads Library (libstdthreads, \-lstdthreads)
 .ds doc-str-Lb-libSystem   System Library (libSystem, \-lSystem)
 .ds doc-str-Lb-libtermcap  Termcap Access Library (libtermcap, \-ltermcap)
 .ds doc-str-Lb-libterminfo Terminal Information Library (libterminfo, \-lterminfo)
diff --git a/contrib/groff/tmac/groff_mdoc.man b/contrib/groff/tmac/groff_mdoc.man
index 1e2452879e1a..279dedd41853 100644
--- a/contrib/groff/tmac/groff_mdoc.man
+++ b/contrib/groff/tmac/groff_mdoc.man
@@ -1797,8 +1797,6 @@ and their results are:
 .Lb libsdp
 .It Li libssp
 .Lb libssp
-.It Li libstdthreads
-.Lb libstdthreads
 .It Li libSystem
 .Lb libSystem
 .It Li libtermcap
diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index 4b035abd6464..0d689ce3eed6 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -42,6 +42,7 @@
 .ds doc-str-Lb-libproc     Processor Monitoring and Analysis Library (libproc, \-lproc)
 .ds doc-str-Lb-libprocstat Process and Files Information Retrieval (libprocstat, \-lprocstat)
 .ds doc-str-Lb-librtld_db  Run-time Linker Debugging Library (librtld_db, \-lrtld_db)
+.ds doc-str-Lb-libstdthreads C11 Threads Library (libstdthreads, \-lstdthreads)
 .
 .\" Default .Os value
 .ds doc-default-operating-system FreeBSD\~10.0