1 files changed, 1 insertions, 0 deletions
diff --git a/io.c b/io.c
index edfcdd646..9cac7631c 100644
--- a/io.c
+++ b/io.c
@@ -7370,6 +7370,7 @@ rb_io_s_binread(int argc, VALUE *argv, VALUE io)
     struct foreach_arg arg;
 
     rb_scan_args(argc, argv, "12", NULL, NULL, &offset);
+    FilePathValue(argv[0]);
     arg.io = rb_io_open(argv[0], rb_str_new_cstr("rb:ASCII-8BIT"), Qnil, Qnil);
     if (NIL_P(arg.io)) return Qnil;
     arg.argv = argv+1;