diff --git a/test/dl/test_cfunc.rb b/test/dl/test_cfunc.rb
index e18a096611..c0bab45700 100644
--- a/test/dl/test_cfunc.rb
+++ b/test/dl/test_cfunc.rb
@@ -59,6 +59,10 @@ module DL
       assert_equal @cf.inspect, @cf.to_s
     end
 
+    def test_inspect_is_tainted
+      assert @cf.inspect.tainted?, 'inspect is tainted'
+    end
+
     def test_to_i
       assert_equal @cf.to_i, @cf.ptr
       assert_equal @libc[@name], @cf.to_i