diff --git a/basis/prettyprint/backend/backend.factor b/basis/prettyprint/backend/backend.factor
index ec76a79d3c..b5709dbc1c 100644
--- a/basis/prettyprint/backend/backend.factor
+++ b/basis/prettyprint/backend/backend.factor
@@ -99,10 +99,13 @@ M: f pprint* drop \ f pprint-word ;
 : ch>ascii-escape ( ch -- ch' ? )
     H{
         { CHAR: \a CHAR: a  }
+        { CHAR: \b CHAR: b  }
         { CHAR: \e CHAR: e  }
+        { CHAR: \f CHAR: f  }
         { CHAR: \n CHAR: n  }
         { CHAR: \r CHAR: r  }
         { CHAR: \t CHAR: t  }
+        { CHAR: \v CHAR: v  }
         { CHAR: \0 CHAR: 0  }
         { CHAR: \\ CHAR: \\ }
         { CHAR: \" CHAR: \" }