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-rw-r--r--ext/json/ext/generator/generator.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/json/ext/generator/generator.c b/ext/json/ext/generator/generator.c
index 98d0ea4..8f7c57e 100644
--- a/ext/json/ext/generator/generator.c
+++ b/ext/json/ext/generator/generator.c
@@ -478,6 +478,7 @@ static VALUE mFloat_to_json(int argc, VALUE *argv, VALUE self)
*/
static VALUE mString_included_s(VALUE self, VALUE modul) {
VALUE result = rb_funcall(modul, i_extend, 1, mString_Extend);
+ rb_call_super(1, &modul);
return result;
}