diff --git a/query/query.go b/query/query.go
index 5921131..6ec8087 100644
--- a/query/query.go
+++ b/query/query.go
@@ -134,7 +134,8 @@ var ReplaceNumbersInWords = false
 func Fingerprint(q string) string {
 	q += " " // need range to run off end of original query
 	prevWord := ""
-	f := make([]byte, len(q))
+	// allocate enough memory to replace (x) with (?+).
+	f := make([]byte, len(q)+len(q)/3)
 	fi := 0
 	pr := rune(0) // previous rune
 	s := unknown  // current state
diff --git a/query/query_test.go b/query/query_test.go
index ad3d75c..c99d6ec 100644
--- a/query/query_test.go
+++ b/query/query_test.go
@@ -248,6 +248,13 @@ func (s *TestSuite) TestFingerprintBasic(t *C) {
 		"select sql_small_result sql_cache distinct centro_atividade from est_dia where unidade_id=? and item_id=? and item_id_red=?",
 	)
 
+	q = "insert into foo (a) values(0)"
+	t.Check(
+		query.Fingerprint(q),
+		Equals,
+		"insert into foo (a) values(?+)",
+	)
+
 	q = "INSERT INTO t (ts) VALUES (NOW())"
 	t.Check(
 		query.Fingerprint(q),