diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index f146fcddce..3fd748e1b3 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -762,7 +762,7 @@ lib/X11/oneko/mouse.xpm
 	    <listitem>
 	      <para>Changes to <makevar>MASTER_SITES</makevar> or
 		other functional changes to the port which do not
-		effect the resulting package.</para>
+		affect the resulting package.</para>
 	    </listitem>
 
 	    <listitem>