1 files changed, 2 insertions, 1 deletions
diff --git a/class.c b/class.c
index 9d333fd9b0..29521c44b2 100644
--- a/class.c
+++ b/class.c
@@ -851,9 +851,10 @@ rb_mod_included_modules(VALUE mod)
 {
     VALUE ary = rb_ary_new();
     VALUE p;
+    VALUE origin = RCLASS_ORIGIN(mod);
 
     for (p = RCLASS_SUPER(mod); p; p = RCLASS_SUPER(p)) {
-	if (BUILTIN_TYPE(p) == T_ICLASS) {
+	if (p != origin && BUILTIN_TYPE(p) == T_ICLASS) {
 	    rb_ary_push(ary, RBASIC(p)->klass);
 	}
     }