diff --git a/user-side-compiler/asm-function.lisp b/user-side-compiler/asm-function.lisp
index f1aa905..bfc20ed 100644
--- a/user-side-compiler/asm-function.lisp
+++ b/user-side-compiler/asm-function.lisp
@@ -29,5 +29,6 @@
           (cerror "Create dummy function with placeholder address."
                   'missing-function-error
                   :format-control "~A"
-                  :format-arguments (list (name token)))
+                  :format-arguments (list (name token))
+                  :source (source token))
           (add-asm-function (name token) #xC0FE)))))