diff --git a/lib/modules/String.pmod b/lib/modules/String.pmod
index 8aa6358f151dcb4346792855b1567469b4240592..666de00b059625499054ee77669170e7d1c121c5 100644
--- a/lib/modules/String.pmod
+++ b/lib/modules/String.pmod
@@ -1,6 +1,7 @@
 #define BEGIN 32
 
 constant count=__builtin.string_count;
+constant width=__builtin.string_width;
 
 /*
  * Implode an array of strings to an english 'list'