diff --git a/foreign/c/pointer.scm b/foreign/c/pointer.scm
index 569c417..eb5fc30 100644
--- a/foreign/c/pointer.scm
+++ b/foreign/c/pointer.scm
@@ -101,7 +101,7 @@
   (else (define c-null?
           (lambda (pointer)
             (if (c-bytevector? pointer)
-              (= (c-memset-pointer->address pointer 0 0 0) 0)
+              (= (c-memset-pointer->address pointer 0 0) 0)
               #f)))))
 
 #;(define c-bytevector->address