diff --git a/source/std.tex b/source/std.tex
index 0170e31451..ab1d082396 100644
--- a/source/std.tex
+++ b/source/std.tex
@@ -83,6 +83,7 @@
 \pdfstringdefDisableCommands{\def\raisebox#1{}}
 \pdfstringdefDisableCommands{\def\hspace#1{}}
 \pdfstringdefDisableCommands{\def\frenchspacing{}}
+\pdfstringdefDisableCommands{\def\@{}}
 
 %%--------------------------------------------------
 %% add special hyphenation rules