diff --git a/docs/latex/wx/tex2rtf.ini b/docs/latex/wx/tex2rtf.ini
index 958316f2c7..e68654f1be 100644
--- a/docs/latex/wx/tex2rtf.ini
+++ b/docs/latex/wx/tex2rtf.ini
@@ -52,6 +52,7 @@ ignoreInput = "ltx.tex"
 \arg [1] {{\it #1}}
 \true [0] {{\tt true}}
 \false [0] {{\tt false}}
+\NUL [0] {{\tt NUL}}
 \NULL [0] {{\tt NULL}}
 \newsince [1] {This function is new since wxWidgets version #1}
 \deprecated [1] {This function is deprecated, please use #1 instead}
diff --git a/docs/latex/wx/tex2rtf_css.ini b/docs/latex/wx/tex2rtf_css.ini
index 910bbad5be..d893d65c49 100644
--- a/docs/latex/wx/tex2rtf_css.ini
+++ b/docs/latex/wx/tex2rtf_css.ini
@@ -53,6 +53,7 @@ htmlStylesheet = "wx.css"
 \arg [1] {{\it #1}}
 \true [0] {{\tt true}}
 \false [0] {{\tt false}}
+\NUL [0] {{\tt NUL}}
 \NULL [0] {{\tt NULL}}
 \newsince [1] {This function is new since wxWidgets version #1}
 \deprecated [1] {This function is deprecated, please use #1 instead}