1 files changed, 1 insertions, 3 deletions
diff --git a/string.c b/string.c
index 4cb62375da..d1a051b6dd 100644
--- a/string.c
+++ b/string.c
@@ -1247,9 +1247,7 @@ rb_obj_as_string(VALUE obj)
     str = rb_funcall(obj, idTo_s, 0);
     if (!RB_TYPE_P(str, T_STRING))
 	return rb_any_to_s(obj);
-    if (!FL_SET(str, RSTRING_FSTR) && FL_ABLE(obj))
-	/* fstring must not be tainted, at least */
-	OBJ_INFECT_RAW(str, obj);
+    OBJ_INFECT(str, obj);
     return str;
 }