diff --git a/js-assembler/assemble-perform-statement.rkt b/js-assembler/assemble-perform-statement.rkt
index 0b754e9..952b4f3 100644
--- a/js-assembler/assemble-perform-statement.rkt
+++ b/js-assembler/assemble-perform-statement.rkt
@@ -15,7 +15,7 @@
   (cond 
     
     [(CheckToplevelBound!? op)
-     (format "if (M.e[M.e.length-~a][~a]===undefined){ RT.raiseUnboundToplevelError(M.e[M.e.length-~a].names[~a]); }"
+     (format "if (M.e[M.e.length-~a][~a]===undefined){ RT.raiseUnboundToplevelError(M,M.e[M.e.length-~a].names[~a]); }"
              (add1 (CheckToplevelBound!-depth op))
              (CheckToplevelBound!-pos op)
              (add1 (CheckToplevelBound!-depth op))