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-rw-r--r--Master/texmf-dist/tex/latex/citation-style-language/citation-style-language-bib.sty3
1 files changed, 2 insertions, 1 deletions
diff --git a/Master/texmf-dist/tex/latex/citation-style-language/citation-style-language-bib.sty b/Master/texmf-dist/tex/latex/citation-style-language/citation-style-language-bib.sty
index ee8f33d5046..4f450ff8dc8 100644
--- a/Master/texmf-dist/tex/latex/citation-style-language/citation-style-language-bib.sty
+++ b/Master/texmf-dist/tex/latex/citation-style-language/citation-style-language-bib.sty
@@ -285,7 +285,8 @@
}
% Hook
-\cs_new:Npn \backref #1 {#1}
+\cs_if_free:NT \backref
+ { \cs_new:Npn \backref #1 {#1} }
% For author-date bibliography