1 files changed, 0 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index fe7b6a1e63..73ae8a69f8 100644
--- a/marshal.c
+++ b/marshal.c
@@ -397,7 +397,6 @@ marshal_dump(argc, argv)
 {
     VALUE obj, port, a1, a2;
     int limit = -1;
-    extern VALUE cIO;
     struct dump_arg arg;
     struct dump_call_arg c_arg;