diff --git a/evaluator/evaluator.go b/evaluator/evaluator.go
index 7521a6d7ad..751d882587 100644
--- a/evaluator/evaluator.go
+++ b/evaluator/evaluator.go
@@ -384,7 +384,7 @@ func (e *Evaluator) checkInList(not bool, in interface{}, list []interface{}) in
 			continue
 		}
 
-		r, err := types.Compare(in, v)
+		r, err := types.Compare(types.Coerce(in, v))
 		if err != nil {
 			e.err = errors.Trace(err)
 			return nil
diff --git a/evaluator/evaluator_test.go b/evaluator/evaluator_test.go
index 27e2aa17b7..8bca5741f2 100644
--- a/evaluator/evaluator_test.go
+++ b/evaluator/evaluator_test.go
@@ -677,6 +677,10 @@ func (s *testEvaluatorSuite) TestPatternIn(c *C) {
 			exprStr:   "2 in (1, NULL)",
 			resultStr: "<nil>",
 		},
+		{
+			exprStr:   "(-(23)++46/51*+51) in (+23)",
+			resultStr: "0",
+		},
 	}
 	s.runTests(c, cases)
 }