diff --git a/library/readutil.yap b/library/readutil.yap
index 699fc7f53..fb9ab3603 100644
--- a/library/readutil.yap
+++ b/library/readutil.yap
@@ -23,7 +23,8 @@
 	read_file_to_codes/2,
 	read_file_to_codes/3,
 	read_file_to_terms/2,
-	read_file_to_terms/3
+                     read_file_to_terms/3,
+                     read_line_to_string/2
 		    ]).