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-rw-r--r--ext/json/generator/generator.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/json/generator/generator.h b/ext/json/generator/generator.h
index b58cc4bc2f..db885d48aa 100644
--- a/ext/json/generator/generator.h
+++ b/ext/json/generator/generator.h
@@ -109,7 +109,7 @@ static VALUE mFalseClass_to_json(int argc, VALUE *argv, VALUE self);
static VALUE mNilClass_to_json(int argc, VALUE *argv, VALUE self);
static VALUE mObject_to_json(int argc, VALUE *argv, VALUE self);
static void State_free(JSON_Generator_State *state);
-static JSON_Generator_State *State_allocate();
+static JSON_Generator_State *State_allocate(void);
static VALUE cState_s_allocate(VALUE klass);
static VALUE cState_configure(VALUE self, VALUE opts);
static VALUE cState_to_h(VALUE self);