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-rw-r--r--macros/latex/contrib/fontspec/fontspec-code-internal.dtx2
1 files changed, 1 insertions, 1 deletions
diff --git a/macros/latex/contrib/fontspec/fontspec-code-internal.dtx b/macros/latex/contrib/fontspec/fontspec-code-internal.dtx
index 7e159a1e10..d86f675dfa 100644
--- a/macros/latex/contrib/fontspec/fontspec-code-internal.dtx
+++ b/macros/latex/contrib/fontspec/fontspec-code-internal.dtx
@@ -128,7 +128,7 @@
% \begin{macrocode}
\cs_new:Nn \@@_init_ttc:n
{
- \str_if_eq:eeT { \str_lower_case:f {\l_@@_extension_tl} } {.ttc}
+ \str_if_eq:eeT { \str_lowercase:f {\l_@@_extension_tl} } {.ttc}
{
\@@_sanitise_fontname:Nn \l_@@_fontname_it_tl {#1}
\@@_sanitise_fontname:Nn \l_@@_fontname_bf_tl {#1}