diff --git a/include/list.h b/include/list.h
index 7e1aece..eda1488 100644
--- a/include/list.h
+++ b/include/list.h
@@ -18,7 +18,7 @@ extern void list_reverse(vtype_list* x);
 #define list_pop(x, s, value)   _LIBCDSB_Generic(libcdsb_list, find, value)(x, s, value, 0, 1)
 #define list_find(x, s, value)  _LIBCDSB_Generic(libcdsb_list, find, value)(x, s, value, 0, 0)
 #define list_rfind(x, s, value) _LIBCDSB_Generic(libcdsb_list, find, value)(x, s, value, 1, 0)
-#define list_countof(s, value)  _LIBCDSB_Generic(libcdsb_list, count, value)(x, value)
+#define list_countof(s, value)  _LIBCDSB_Generic(libcdsb_list, count, value)(s, value)
 #define list_indexof(s, value)  list_find(0, s, value)
 #define list_remove(s, value)   list_pop(0, s, value)
 #define in_list(s, value)       (list_indexof(s, value) >= 0)