diff --git a/pkgs/tools/typesetting/tex/texlive/combine.nix b/pkgs/tools/typesetting/tex/texlive/combine.nix
index 6622a03decc5..ab40cdb86d09 100644
--- a/pkgs/tools/typesetting/tex/texlive/combine.nix
+++ b/pkgs/tools/typesetting/tex/texlive/combine.nix
@@ -214,7 +214,11 @@ in buildEnv {
     texlinks.sh "$out/bin" && wrapBin
     (perl `type -P fmtutil.pl` --sys --all || true) | grep '^fmtutil' # too verbose
     #texlinks.sh "$out/bin" && wrapBin # do we need to regenerate format links?
+    # Note that --syncwithtrees *only* removes the missing files from the configuration,
+    # but does not generate map files.
     echo y | perl `type -P updmap.pl` --sys --syncwithtrees --force
+    # This does generate the map files.
+    perl `type -P updmap.pl` --sys --force
     perl `type -P mktexlsr.pl` ./share/texmf-* # to make sure
   '' +
     # install (wrappers for) scripts, based on a list from upstream texlive