diff --git a/docs/latex/wx/strmbase.tex b/docs/latex/wx/strmbase.tex
index 8c495730c3..dc7a184b51 100644
--- a/docs/latex/wx/strmbase.tex
+++ b/docs/latex/wx/strmbase.tex
@@ -127,7 +127,7 @@ real position.
 
 \membersection{wxStreamBase::OnSysWrite}\label{wxstreambaseonsyswrite}
 
-\func{size\_t}{OnSysWrite}{\param{void *}{buffer}, \param{size\_t}{ bufsize}}
+\func{size\_t}{OnSysWrite}{\param{const void *}{buffer}, \param{size\_t}{ bufsize}}
 
 See \helpref{OnSysRead}{wxstreambaseonsysread}.