diff --git a/activerecord/test/cases/adapters/mysql/quoting_test.rb b/activerecord/test/cases/adapters/mysql/quoting_test.rb
index ca476947fc..426b088e2f 100644
--- a/activerecord/test/cases/adapters/mysql/quoting_test.rb
+++ b/activerecord/test/cases/adapters/mysql/quoting_test.rb
@@ -15,14 +15,14 @@ class MysqlQuotingTest < ActiveRecord::MysqlTestCase
 
   def test_quoted_date_precision_for_gte_564
     @conn.stubs(:full_version).returns('5.6.4')
-    @conn.remove_instance_variable(:@version)
+    @conn.remove_instance_variable(:@version) if @conn.instance_variable_defined?(:@version)
     t = Time.now.change(usec: 1)
     assert_match(/\.000001\z/, @conn.quoted_date(t))
   end
 
   def test_quoted_date_precision_for_lt_564
     @conn.stubs(:full_version).returns('5.6.3')
-    @conn.remove_instance_variable(:@version)
+    @conn.remove_instance_variable(:@version) if @conn.instance_variable_defined?(:@version)
     t = Time.now.change(usec: 1)
     refute_match(/\.000001\z/, @conn.quoted_date(t))
   end