1 files changed, 3 insertions, 2 deletions
diff --git a/io.c b/io.c
index 637b68def9..f63dbcd120 100644
--- a/io.c
+++ b/io.c
@@ -1691,8 +1691,9 @@ rb_io_ungetc(io, c)
 	rb_raise(rb_eIOError, "unread stream");
     rb_io_check_readable(fptr);
 
-    if (ungetc(cc, fptr->f) == EOF && cc != EOF)
-	rb_sys_fail(fptr->path);
+    if (ungetc(cc, fptr->f) == EOF && cc != EOF) {
+	rb_raise(rb_eIOError, "ungetc failed");
+    }
     return Qnil;
 }