1 files changed, 3 insertions, 0 deletions
diff --git a/io.c b/io.c
index a7e1047e7b..0c2ba4d0af 100644
--- a/io.c
+++ b/io.c
@@ -829,6 +829,9 @@ io_read(argc, argv, io)
 	    rb_str_resize(str, 0);
 	    return str;
 	}
+       if (len > RSTRING(str)->len) {
+           rb_str_resize(str,len);
+       }
     }
 
     READ_CHECK(fptr->f);