diff --git a/gc.c b/gc.c
index e02f9b136f..9d59163ee0 100644
--- a/gc.c
+++ b/gc.c
@@ -3375,19 +3375,6 @@ rb_gc_latest_gc_info(VALUE key)
     return rb_gc_impl_latest_gc_info(rb_gc_get_objspace(), key);
 }
 
-static VALUE
-gc_latest_gc_info(rb_execution_context_t *ec, VALUE self, VALUE arg)
-{
-    if (NIL_P(arg)) {
-        arg = rb_hash_new();
-    }
-    else if (!SYMBOL_P(arg) && !RB_TYPE_P(arg, T_HASH)) {
-        rb_raise(rb_eTypeError, "non-hash or symbol given");
-    }
-
-    return rb_gc_latest_gc_info(arg);
-}
-
 static VALUE
 gc_stat(rb_execution_context_t *ec, VALUE self, VALUE arg) // arg is (nil || hash || symbol)
 {
diff --git a/gc.rb b/gc.rb
index f2790ef85d..ce5f3ffff6 100644
--- a/gc.rb
+++ b/gc.rb
@@ -320,7 +320,15 @@ module GC
   # it is overwritten and returned.
   # This is intended to avoid probe effect.
   def self.latest_gc_info hash_or_key = nil
-    Primitive.gc_latest_gc_info hash_or_key
+    if hash_or_key == nil
+      hash_or_key = {}
+    elsif Primitive.cexpr!("RBOOL(!SYMBOL_P(hash_or_key) && !RB_TYPE_P(hash_or_key, T_HASH))")
+      raise TypeError, "non-hash or symbol given"
+    end
+
+    Primitive.cstmt! %{
+      return rb_gc_latest_gc_info(hash_or_key);
+    }
   end
 
   # call-seq: