1 files changed, 1 insertions, 6 deletions
diff --git a/class.c b/class.c
index e680dc7a67..6aed94a992 100644
--- a/class.c
+++ b/class.c
@@ -365,12 +365,7 @@ rb_include_module(klass, module)
     if (NIL_P(module)) return;
     if (klass == module) return;
 
-    switch (TYPE(module)) {
-      case T_MODULE:
-      case T_CLASS:
-      case T_ICLASS:
-	break;
-      default:
+    if (TYPE(module) != T_MODULE) {
 	Check_Type(module, T_MODULE);
     }