diff --git a/docs/latex/wx/app.tex b/docs/latex/wx/app.tex
index f662fd4048..386f8530f6 100644
--- a/docs/latex/wx/app.tex
+++ b/docs/latex/wx/app.tex
@@ -231,7 +231,7 @@ Returns 0 under X, and the wParam of the WM\_QUIT message under Windows.
 
 This function is called when an assert failure occurs, i.e. the condition
 specified in \helpref{wxASSERT}{wxassert} macro evaluated to {\tt FALSE}.
-It is only called in debug mode (when {\tt \_\_WXDEBUG\_\_| is defined) as
+It is only called in debug mode (when {\tt \_\_WXDEBUG\_\_} is defined) as
 asserts are not left in the release code at all.
 
 The base class version show the default assert failure dialog box proposing to