1 files changed, 2 insertions, 1 deletions
diff --git a/io.c b/io.c
index 28cb8a51c7..90338e6f2a 100644
--- a/io.c
+++ b/io.c
@@ -2451,7 +2451,8 @@ rb_io_puts(argc, argv, out)
 	    line = rb_obj_as_string(argv[i]);
 	}
 	rb_io_write(out, line);
-	if (RSTRING(line)->ptr[RSTRING(line)->len-1] != '\n') {
+	if (RSTRING(line)->len == 0 ||
+            RSTRING(line)->ptr[RSTRING(line)->len-1] != '\n') {
 	    rb_io_write(out, rb_default_rs);
 	}
     }