diff --git a/documentation/osissues.html b/documentation/osissues.html
index 95050cf0b..a2b36dc68 100644
--- a/documentation/osissues.html
+++ b/documentation/osissues.html
@@ -148,7 +148,7 @@ to the XftFont structure instead.
 <P>If FLTK was compiled with Xft support enabled, <tt>fl_xftfont</tt>
 Points to the xft font selected by the most recent <A
 href="drawing.html#fl_font"><TT>fl_font()</TT></A>. Otherwise 
-it will be 0. <tt>fl_xftfont</tt> should be casted to 
+it will be 0. <tt>fl_xftfont</tt> should be cast to 
 <tt>XftFont*</tt>.
 
 <H3>Changing the Display, Screen, or X Visual</H3>